OP again - We've been at this daycare for ages, and the teacher knows she'd be doing it to help out in an emergency, not as a "convenience". It honestly doesn't surprise me at all she'd be willing to go out of her way once (or twice) to help out - there's a reason my kids really like her
Thanks for the insight - seems like twice the hourly rate would definitely be sufficient to make it worth her while and let her know I really appreciate the help.