Conventional wisdom would suggest that when the LBS starts GAL and sticking to boundaries, it provokes anger, resentment, etc etc. The picture that the WAS/WS has created about the LBS starts getting chipped at and it brings a range of emotions. Things like 'why now?' amongst others.
I use my words carefully and hence I said 'suggest'. You don't truly know what's bringing these emotions out of her and as I said earlier, try not to speculate. It will drive you up the wall as you won't find the answer. Curiosity about their behaviour easily turns into trying to mindread and going down tunnels. I know it's hard not to do it, but that's why GAL and doing things for yourself are important right now. Keeps the focus on YOU.