C.
I would put a pull-up on her (if you have them on hand just because it's easier than working with a diaper at potty time since she DOES go on the potty). That way you can still ask her every few hours keeping the same routine, but you don't have the MESS for either of you. And it keeps the potty a positive thing for everyone (not frustration from the mess) and allows her to still try the potty every few hours so she isn't quite as likely to revert back. With the new baby coming, don't be surprised if she does revert back a couple weeks after the baby comes home, but you've still got more time for it to become established so it MAY not be an issue at all with the new baby. Best wishes to you! I'm sure she'll be back to staying dry soon, after she feels better. :)