Nap Advice PLEASE

I'm registered on here but chose to stay logged out for this.

We have a 3 yr old dcg who has become EXTREMELY difficult at nap time (she's going through this stage of defiance for the fun of it. yeah, I'm serious. She's found an enjoyment for defiance. Never seen anything like it). Anyway, at nap time she has become impossible to get to sleep. She's so tired, she could go to sleep in two mintues time, if she'd just let herself lay still that long (her eyelids are so droopy, and she'll be yawning the whole time, rubbing her eyes, etc). She's always been quick to go to sleep, and she still is, once she lets herself, but it's like she's decided she doesn't want a nap, and since she doesn't, no one else should either. She will NOT lay down on her own. She has to be placed on her cot. Then she continues to fight us, trying to get up, playing around on her cot, talking really loud, etc. The others might get to sleep if they're lucky, but she just refuses to let herself, so she'll yell, talk out loud, jump off her cot and run, go around and wake the others up, etc. If we are right beside her, trying to pat her back, she'll squirm around, and be as loud as she can. Then she'll shove our hand away, and stand on her cot, or scoot herself forward to kick her feet against the wall, or slap them on the floor and have a really loud screaming fit when she has to be physically laid back down again. Which of course wakes everyone up. There isn't any other room to place her in.

I can't even use the restroom because as soon as I walk away she jumps up and go around to wake the others up by tickling them, yanking their blankets off, etc. or just run off to play with toys (and make as much noise as possible with them). I'm about to lose it. I cannot go through this everyday! But termination is NOT an option. We can't term her just because she won't nap. Besides that, there's no way we could afford (financially) to lose her either. She's been here since she was a baby, so we have this attachment thing. Her parents are having the same problem, but at least at home she's an only child and her non-nap doesn't result in nobody else having a nap. The afternoons have been awful because everyone (especially her) are so tired, and of course behaviors are at their worse when they're tired. By the way, I'm not the owner, so I couldn't term her, for that reason alone (but even if I was the owner I couldn't do it). I've never had this much trouble with a child before. Even the most difficult ones go to sleep, or at least know to lay quietly. This one, though, I have to sit beside the whole time to keep her from waking everyone up. I'm sure its probably for the attention, but if I walk away so she's not getting that attention (or if I'm busting to use the restroom too much to hold it any longer), she will immediately get up. If I could set her up with quiet activities, but that won't work either because she just seems determined to be as loud as possible. The owner sometimes has this problem, but not every time, like me. I'm ready to scream. or cry. Something.

Please tell me what you'd do if you were in this situation (without the option of terming)