I'm sorry. . . I *guess* it's good that you know for sure what happened. . . :(
We never did figure out if she was sick. . . there are some illnesses that can cause a frog to really TRY to get out of the water. I'd think you'd have noticed other symptoms if this was the case, but. . . you're new to frogs, right? It can be really difficult to know what to look for when you're still getting used to what 'normal' is to these guys. . .
If you decide to get another frog, be sure to look at the frogs in the tank very closely before deciding to bring one home, judge their health, ask questions - figure out what they've been feeding them at the shop, so you know what they're used to. Don't purchase any frog from a tank in which you see any evidence of sickness or death, and NEVER attempt to ‘rescue’ a sick frog. . .frogs are usually pretty tough little guys, as Watty said. *usually* illnesses are brought about by poor water quality, so if you haven't been, it's a good idea to keep an eye on those parameters.
Good luck, Popcorn. If you get a new baby, be sure to stop in and let us know!
I'm so sorry, again, to hear of your losses. :(