How's this even a question? Of course Louise should go back and get help! What can a tiny do by herself? Jeez, don't tell me this is gonna turn into a horror movie where everyone except the killer are morons! The fact that Louise found them is great, she took advantage of the fact that she was tiny to check under the door. But there's no way she should go in alone...

Author's Response:

This is true, but Louise is very driven to prove a point right now and can be very short-sighted. Also who knows where Jenna went to look for her, and it might take too long for her to reach Elise and Liza. Plus she doesn't know how much danger Franky is in. Does she risk her own safety and go in solo or does she risk Franky's safety by taking the time to go get help?