It occurs to me that I left on quite a cliffhanger. The short of it: She didn't cancel our lease. Not only did she forget that threat, but apparently she became totally belligerent when LP explained, in late May, that we would be moving out.
Seems LP told Gloria that some of her landlady practices were illegal; Gloria replied "You're illegal!" LP also called her a slumlord, but Gloria didn't know what that meant, so then they had to have a time-out so that LP could define it. At least this has been a learning experience for us all.