Spayed Kitty is Being Too Crazy!!

We were told to stop Ellie from jumping, running, etc., for the next week or so, but we just brought her home an hour ago and she has been CRAZY just like usual. I'm scared her stitches will rip out. We had a nice bed prepared for her and everything in our bedroom, expecting her to be sleepy and sore, but she has been purring and racing around just like usually, jumping on things and being far too active. 

We can't put her in a smaller room, the bathroom is actually her favourite place to frolic, she loves rolling around in the bathtub and jumping from the toilet to the sink, so that isn't an option. We don't have 

Also, the vet put an e-collar on her and she has already successfully removed it. We can't tie it tighter, she just wiggles it loose. I have no clue what to do. 

I am so worried she is going to hurt herself, we can't afford medical treatment if she does .... we stretched ourselves thin getting her spayed. 

I wouldn't worry about the cone unless she starts licking the incision excessively.  I wouldn't try to limit her activity either.  Just keep an eye on the incision site and make sure it doesn't come open.  Kitties really are pretty good at self-limiting their behavior.

Okay, thanks so much!!! She seems to be doing OK, hopefully she isn't overexerting herself