Is it normal for plates to drop if they lose weight and go up a couple points on the SMV scale?

 

One of my plates of 3+ years recently went from having lower SMV to being pretty much equal to me, and I haven't seen her in a couple of weeks. She always flakes on plans with perfect plausible deniability, so I've been unable to call her out on her shit. Obviously she is fucking someone, oh well.

 

I decided last night to ignore her excuse and soft next. How would you guys play a situation like this? Like I said she's been a plate for over 3 years, I was always clearly her alpha but once she started to think she could do better, the shift was immediate.