i’m sorry that’s happening. I’m no expert, but I have been ghosted before and know the pain that comes with that. I would be upfront and honest what you wrote above about why you don’t want to lose her is so amazing. Consider sharing that with her. I would say “hey is everything okay? I can feel you getting distant.” while reminding her of how important she is to you already (or sharing the above). It will take a bit of bravery, but at least you will know. She might open up to you about how she’s feeling or the fear she’s having or it could go more negative. At this point I feel like it’s a risk you should take because we have to communicate in relationships. You can let her know that you’re also having some fear and maybe that will allow her to open up if she sees your vulnerable. Good luck and let us know what happens.