S.,
Gently keep telling her that the TV is done for the night.
Working in a daycare facility years ago, I often came across kids who would argue over the same toy. Thus the toy was no longer wanted, just the ability to 'have' it. I put the toy in 'time out' until such time as they could reasonably figure out who should have it. By the time they registered that they couldn't have the toy - and each other couldn't have the toy, they had moved on to find each separate items.
The TV is not really needed - she needs sleep. Put the TV in time out (not even sure if you have time out but at this point, its just an idea) for the evening. Don't get into 'it's the adults time to watch', or anything. Just keep it simple.
If you have not established a routine, start now, and incorporate as few or many elements that are reminders of sleep. You had her sleep with you - this is not a mistake - simply a different way of having a baby go to sleep.
Transition, while I am no expert, is going to be rough - a child likes things to stay the way they are. Little routine changes are going to work much better for you than cold turkey, I think. Distraction may be an added benefit, may not, depending on how up your baby is on your presence after you are gone.
I wish you good luck, and that you and your baby have a peaceful transition to her sleeping in her big girl's bed.
M.
PS: congratulations!
PPS: just thought of another idea that someone else once gave: have her mattress or a sleeping bag, next to your bed (but not in it), so that if she wakes in the night, she has somewhere to go without disturbing the new baby.
PPPS: you might also want to explain about the new little one due soon - kids understand more than you think.