this is going to be rough for about 3 nights, but if you stay tough it will work: out of 5 kids I had at least two we had to do this with:
when she wakes up you go in and comfort her.. change her diaper if it needs it, give her a little water, makes sure she is okay with all that..then gently put her in bed, rub her back gently for a minute then walk out.. do not go back and pick her up if she cries.. let her cry for 5 minutes.. then go back and gently put her down again and rub her back (don't pick up and she probably doesn't need the diaper or something to drink this time) and then walk out again... this time stay out 10 minutes... if she is still crying - go back and do it again... staying 15 minutes this time. She should cry herself to sleep by this point. This worked with one of my kids within three nights - it was rough for us having to listen to him cry but we would hang tough. Another one was a bit tougher (but we later found out he had some food allergies). If she is still crying after the 15 minutes - get up with her read a book, give her a little warm milk but don't spend too long, just enough to get her settled, then lay her down again.. you might have to do the whole routine again... but after about 3 nights.. unless there is something else wrong... she should catch on... you will lose some sleep for a few nights and perhaps you can start on a day where you could take turns when you don't have to be at work the next day (your "weekend"). If you are sticking to the routine and it doesn't work, you may want to investigate what might be waking her up. but for now .. you are rewarding her cyring and waking by taking her to bed... in her mind why should she stop??? if it something else.. this routine won't work. If it is a security issue.. your coming in and reassuring her every 5, 10, then 15 minutes will help with that.
another thing is to maybe put some white noise in her room (run a humidifier, some soft music, one of those waterfall things) in her room - see if she has as soft blanket she likes and warm it up in the dryer before you put her to bed, or if there is a small stuffed animal she likes let her take it to bed with you.There are also these stuffed animals that have a little bag with beans or rice in them that you can remove and heat up then put back into the stuffed animal.. my daughter loves hers. There are many things that you can do to provide her comfort if it is a security issue. but you'll also have to teach her who is boss.. and right now when it comes time to getting her way and getting in bed with you. sounds like she is! (LOL) good luck.