My husband flails sometimes in his sleep and has spoken to me in his sleep.The flailing was more dangerous but the talking is...weird. Sometimes he can actually have a mild conversation before he's out again and it's always mildly creepy. One of them involved something about a boat and then he giggled and said "Boom!" a few times. Little weirded out by it.
How big is your bed? Queen? Double? Get a full King if you are able. The space helps.
Also I've learned if I'm waking up my husband I have to do it very very slowly and usually kiss his arm or stroke his hair so he realizes I'm not a danger to him. I wait about a minute or so before I speak to him.
I'm not afraid of him, but I certainly don't want to get elbowed or smacked while he tries to wake up out of whatever dream he's having. That's nothing against him, in fact we've eventually turned it into a joke between us (for the record he's a foot taller and well over twice my weight).
Can she maybe use a noise to wake you? Something she can have on her nightstand? What about turning the light on? I can understand not wanting to touch you if you're sounding scary. When my husband is sounding scary I'll usually wake him up, but it took a couple of years to figure out how to. In between I was more than a little nervous.
This isn't something you need to be shattered about hon. It doesn't mean anything but what she said. She's afraid of what you'll do if she tries to wake you up suddenly. She's not afraid of *you*. She hasn't stopped caring. She's just not sure how to deal with it.
You can try finding a sleep clinic near you to possibly give her (and you) some insight, or you can try talking to your doctor about it and see what they have to say.
In the meantime, realize that this does happen to a lot of people, and we all can learn to adapt, but it takes time. I don't love my husband any less for his sudden flaillings, I just wake him up slowly or prepare when to duck :P