its Schrodingers Kitten Heels.
she's weak because she has a tiny minority thats getting smaller and a PCP thats getting ideas above its station, on the other hand she's strong because of her poll ratings, media image, simple message (yeah, i know..) and Corbyns/Labours ratings.
if she were able to bring about a GE - and to be strictly fair, having a majority of 8 comes quite close to the mechanisms within the FTPA for triggering an election - she's unassailable. current polling suggests a 100+ majority, and no doubt whatsoever about what she'd have a mandate for, so Tory MP's throwing their toys out of the pram would be on a hiding to nothing...