Okay, 101 is not a "spike," it's a slightly elevated fever. Actually, if that's rectally, it's barely a fever at all. A normal temp is 99.6 rectally. Nothing to worry about at all. If it "spikes" to 103-104, then take her in. She's old enough to get tylenol to keep her comfortable.
If she's going to get another ear infection, she's going to get it, so worrying about it isn't going to help. I don't mean to be harsh, but that's just the truth. Really at this age, there's nothing you can do to keep them from getting ear infections, short of getting tubes. So just keep her on the omnicef (make sure you feed her lots of yogurt too to keep her gut regulated) and try to just enjoy the weekend.
Finally, if she has to have tubes, it's not the end of the world. Actually, it's not even something that will take a whole day. So if that happens, it happens, and I wouldn't worry about that either.
Try to get some rest!