I think if things have gotten so bad that she doesn't want to do anything but watch TV, then you have to be strong, and tell her that she will not get to watch the tv at all until she does the other things that need to be done. Be specific as to what things you want her to do, and make it clear that if she doesn't then she will lose the privilidge of watching tv. I usually wouldn't say to completely remove something like that, but it sounds like the TV has completely taken over and may need to be removed for a long while so she can get into more normal healthy activities. If it gets to that point then turn off the tv and don't allow it on while she is awake, at all. Stay strong and don't change your mind, keep it off. Make it clear to her that if she can start doing other things that you feel she should be doing for a set time (that you decide on) only then will the TV be permited. Even after she gets TV privilidges back, only allow it on at certain times of day. Find out when a couple of her favorite programs are on and let her watch, then turn it off so she can do other things.
Buy the way, at that age wanting to watch the same things over and over is completely normal. Does she like being read to? Reading can be a greart activity to do with children. They usually like the same book read over and over also, that's ok the repitition is actually helpfull. Make sure when you read you keep it interesting, change your voice, use inflection, sound excited on exciting parts, and pick books about things she is interested in. You might even be able to get her interested in other related activities if you find books she likes that have some interesting activities or topics. If she wants to pretend to read also let her, that is really good for little ones.
I don't know if you have this option, but I added a channel called Baby First TV for a few dollars a month, and my kids love it. It is good for todlars and preschoolers. It has nothing offensive or bad for the kids, and it teaches them all sorts of things. The programing holds their attention, and puts lots of things that you can extend out further with other activities. It's also designed so you can interact with them while they watch. At the end of the night when it's late they put on a show with helpful parenting advice, then around 11 they put on sleepy music with soothing videos, it's supposed to be to help the kids sleep but it usually helps put me to sleep. Anyway, I really like it and so do my kids. If there were anything I wouldn't belly ache over them watching for hours it would be that. Still, get her doing other stuff as much as possible so she can start enjoying the world around her.