I understand how hard that transition is! Our son slept in bed with us until he was a year old, he had reflux real bad and was colicky all the time so instead of getting up to nurse him 8-10 times a night, he just slept next to me so I could try to get as much sleep as I could manage. He did start getting better around 10 months and finally at a year my DH put his foot down. It was hard for me and DS, DS cried a lot at first and wanted Mommy. But in the end, I can say it was worth it! No more tiptoeing around our bedroom if we woke before him and no more sharing the bed with a wiggly baby. DS still loves to crawl in bed with us once in awhile, but that's it.
I'd say, if your little Ava is ok with the transition and you're not, see what you can do to make it more bearable for you. Can you put the crib by her bedroom door so you can peek in easily? Do you have a baby monitor? I love having one of those, I can crank that up and hear the littlest things in his room, even if we're out watching a movie in the living room. No more being afraid of not hearing him wake up and cry and need me.
Are you worried about how she will feel emotionally, or more worried something bad might happen while she's out of your eyesight?
If emotionally--you could do things to comfort her (even if she doesn't need it, it might help you!) like putting one of her stuffed animals in your bed for a couple nights so it smells like Mommy, and then put it in her crib--I've also laid down flat my pillowcase on his mattress so it smells like me.
If wondering about something bad happening, keep in mind for 8 or however many hours a night she was in your room, you were sleeping and not totally aware of her, yet she did just fine.
And lastly, what about an Angel monitor? It sets off an alarm if your baby stops moving/breathing. They're spendy though---I think about $100. Just a thought! Nice for paranoid moms like you and me!
PS I slept with a stuffed animal for a little while after DS was no longer in bed with us, I missed that little warm body curled up in my arms!