Her decision might have been, that whatever happened this night between Paulie and Tori and no matter what's going on between them, Paulie and Tori are the first people in her life she really can consider as friends.

And friends are so much more important to Mouse than the fact that there might be something going on between Paulie and Tori that's more than only being friends.

Actually this might be the moment, when Mouse decided that Paulie being in love with Tori doesn't bother her at all. When she's dressed, she seems to be "okay" with it.