M. B is right - sometimes teething can cause baby to wake up. Have you determined if she's teething? If she is, give her tylenol before you put her to bed. It's also true that growth spurts happen, but I doubt that she would wake up that SOON because of a growth spurt if you are feeding her before she goes to bed. She may have gas, so if you burp her really good before she goes down, that may help.
Are you putting her down awake when you put her to bed? If you aren't, you should be. Her doctor is right - she should be self-soothing. If you don't give her the opportunity to, she will expect you to do it for her, and that includes waking herself up in order to get mommy to come back in and be with her.
You let her cry, or you can just sit in the floor beside her crib and put your hand through the slats and touch her leg. She'll stand up because she's old enough to do that now, but you stay on the floor and just touch her leg so that she will eventually lay down to be closer to you. Don't talk to her. Don't move around. Certainly don't pick her up. She will finally calm down. Take your hand away and just sit there. She will have to put herself to sleep. After a week or so of this, she will just stop waking up because she's not getting anywhere with it.
I highly recommend that you do this before she is weaned off of bottles, which should be in the next 3 1/2 months. The longer you wait, the harder it is. You certainly want her to be sleeping through the night by the time she gets out of the crib, or your life will very tough.
Dawn