The real problem for your daughter is that she doesn't know how to put herself to sleep without you there. Kids do wake up in the middle of the night, and if they have to have you to get back to sleep, you're going to find yourself soothing your 10 year old back to sleep several times a night! New babies do not have the ability to sooth themselves, but by 7 months old, your daughter is fully capable of doing so. She just doesn't know how.
It sounds like you are already able to get her to sleep in her crib, but are having trouble with her waking up throughout the night. So try rocking her (or however you put her to sleep) until she is VERY drowsy, but not fully asleep, and then set her in her crib. If she begins to wake herself up, pat her, stroke her hair, let her hold your finger, or do whatever soothes her, but do not remove her from the crib. Also, very importantly, say nothing, and do not make eye contact. At 7 months, she may fuss if she knows you will give her attention for it. If she finds that you will not play with her during the night, she'll be less eager to wake up.
If she wakes up and cries while you are soothing her, pick her up and repeat the rocking process as often as necessary until she is asleep in her crib (but make sure she is at least slightly awake when you set her down). If she goes to sleep but then wakes up later, let her cry for 5-10 minutes and give her a chance to put herself to sleep. Some people say to let them cry longer, but I've never been able to let my baby cry for more than 10 minutes, so do what feels right to you.
At first, you're probably going to have to do this several times a night, so be prepared. Eventually, you should be able to set your baby down when very drowsy and walk away without soothing her in her crib, and have her put herself to sleep. This may take several weeks to accomplish. You should also eventually see that while she may continue to wake up several times during the night (and even talk to herself during these awake periods), she will put herself back to sleep without you.
Best of luck! I went through this with my son when he was 3 months old, and I think it's hard at any age. I decided I was comfortable moving my son out of my room when he was a little over 3 months old because I wanted to improve my sleep, and I didn't want to have to hold him through his naps every day anymore. I still get plenty of snuggle time when I rock him, and I'm still really proud when he puts himself to sleep! It takes a little while to get it down, but once you do, it's worth it!