A.C.
Go in and put her down on her bottom. Console her without picking her up by rubbing her tummy and talking sweetly to her. Just let her know that you are there, but it's time to sleep and leave the room. Repeat it every so often until she goes back to sleep. Eventually, she will soothe herself back to sleep and you won't have to go in at all because she won't cry or anything. Look up Ferber method and see if that is something that will work for you.