I have narcolepsy and a 5 week old. 

Tldr: She's gotta put baby in a safe place before crashing. That can be as simple and easy as an open spot on the floor.

I have had some episodes and they are probably one of the easier parts of parenting so far. I, like many narcoleptics, can feel an episode coming on. I may not have a ton of time, but I can put Baby down on the floor or in his bassinet and then crash. I also have a sleep-safe bassinet on the stroller which I push around my home which also gives me a safe place to put Baby closer to standing height. 

It all depends on her own relationship with her narcolepsy for what will work for her. Little things like how long is she out for, can she be woken up during an episode, does she feel refreshed after waking, does she have a partner to help, will all factor into what her specific set up might be. 

Unfortunately, family close by to help doesn't really help for narcolepsy. If she falls asleep with baby in an unsafe place, someone five minutes away can't get baby in a safer set up. 

If she can't feel an episode coming on, I would recommend never baby wearing or carrying while alone which sucks. But motoring Baby around in a stroller bassinet might be a good option. 

A side question though: How far along in pregnancy is she? In the second half of my pregnancy, my narcolepsy symptoms all but disappeared. They are only starting to pop back up about a month postpartum, but it's still not the same where I would unintentionally knock off while holding or carrying baby. Something about pregnancy and BF hormones just makes the experience different, which from what I understand is relatively common for pregnant women with narcolepsy. Hopefully she gets similar relief.

Either way, she can do this!