I think that she will be fine. It doesn't sound like anything serious or complicated has happened that would need your forever-attending presence. Remember that cats normally do this all on their own so I think your kitty can manage a few hours of indepedence.
Anyways, this thread was so exciting. I just finished reading it from beginning to end and it was like reading an exciting book or something. I couldn't wait the half second it took my internet to load the next page of the thread to see what happens next, haha.
Congratulations to you and your cat on a successful birth