If there are no open wounds I dont think you need to quaranteen her. Not unless she cant eat on her own. I'd feed her and see if she can eat without help and if so, you can probably put them back together. The stress of being moved can hinder healing sometimes. Keep an eye out just in case the other one starts to pic on her because of her injury. Its doubtful but with wild frogs it can happen.
And I wouldn't worry about broken bones. My american green was a play thing for my cat for 5 minutes before I realized what was going on and he ended up holding his arm the same way for a good 2 weeks or so. He had open wounds, though. There bones are pretty pliable and hard to totally break (especially the small ones like greens and grays).
If your worried about it happening again you could try using duck tape. Take a strip as long as the tank is tall and split it in half, then place the half in the center of another full piece the same length, sticky sides together, so there is about 1/4th the width on either side thats sticky. Put the tape on the tank so that the part of the tape that isn't sticky is covering the crack in the door. This will close up the gap, still allow you to open the doors easily, and your frogs wont be exposed to the glue in the tape.