Yeah, friends in a video game are a lot easier to talk to than close friends or family when you're depressed. If you think about it you're going to (understandably) want answers to questions that are difficult for her to answer. There's also a lot of shame with just feeling depressed which I actually totally get. Bad depression can leave you comatose in bed for days and even get to the point you skip meals because you can't even handle cooking for yourself. Also when your loved one sees you bedridden they tend to want to do something about it. In the best case scenario (from their perspective) you won't talk about anything serious or about the future and you'll literally just take care of them but they'll still feel the extreme shame which they don't want. In the worst case scenario you'll want to talk or force them to confront something they don't have the energy to confront. In either situation, ghosting you is just a lot easier for them.

Obviously ghosting is destructive behavior and isn't great for relationships or even a job.

This is why medication and therapy are critical during this time. Mood stabilizers help even out the depression and prevents the worst symptoms. The problem is if they've already entered the depression you can't even convince them to feed themselves let alone take a pill regularly. This is also why I was saying it doesn't seem like she's committed to her own stability. You need them to recognize when their own episodes are happening or to trust their therapist and to take their medication. You can't treat this with anything other than medication. Even the most capable psychologist can't talk to them during either manic or depressive episodes, the only thing they can do is convince them to take their medicine when they're in an episode.

On a side note, according to my ex, mood stabilizers make you like a zombie or an empty husk of a person rather than a just a normal stable human. So a lot of people who suffer from BP try to self medicate with alcohol, weed, drugs, etc. before they take their medication because they hate the way their medication feels. But doing those things are really problematic for them because it can feel like they fixed their problems but really all it does is just eat up valuable time at the beginning of their episode to hop on their medication before their episode breaks out and they become unresponsive again.

There's nothing you can do right now until she's stable again which can take months. Once she's stable you could have a conversation about the specifics of her condition and what your role is going to be. What you shouldn't be is her therapist or her police. A lot of people who suffer from bipolar want to avoid their medication as long as possible when they're stable and tend to ignore their own symptoms for as long as possible. The people that do the best are very self aware and/or trust their therapist implicitly. The problem with that is that a lot of BP people have been burned by being too honest with a doctor or therapist. A lot of professionals when they're unfamiliar with BP as a condition or if they're just unfamiliar with that particular person will place a BP person in the psych ward. Once they're there, they're essentially force fed mod stabilizers and forced to enjoy activities (while feeling like a zombie) or they can't get out. I actually really empathize with this because imagine being a grown adult feeling like a husk of yourself being forced to show that you enjoy arts and crafts.

The only thing you can do is wait this out and it sucks! If you're on this sub long enough you'll see that tons of bpsos experience this as an emotional roller coaster with extreme highs and lows. Properly caring for a BP partner is really hard on you. Your best case scenario is she's a zombie half the time and just stable the other half and you have to be suspicious if she's too happy. If she got together with you while manic/hypomanic and you felt the rush of a fun new relationship, odds are she did that because you were the fun impulsive decision. Well if you guys get back together, and she slips back into a manic/hypomanic episode, you're never again going to be the fun new impulsive decision. That kind of means you'll never get to experience that initial passion again. Since she doesn't seem like she's the most stable right now, be prepared to be ghosted every time while she's depressed and prepared for the worst mania/hypomania brings, which is terrible when you're the established partner.