Wegovys effect on mental health?

Hello everyone I'm here to ask some questions on some side affects of the drugs and what to expect? i personally am not on it but my gf has been on it for about 6 months and has finally started her maintenance dose.

I am unfamiliar with the drug besides the fact it helps reduce hunger to lose weight. i am wondering for those of you who have started the drug did you notice or someone in your life (friend, family, partner, etc) notice you acting differently? negatively? fatigue often? mentally drained?
I'm not asking for relationship advice but I have noticed a shift in my gf mood and personality since shes been on it much less her bubbly, enthusiastic, caring self. She constantly feels tired and drained.
(she has last close to 40 lbs which I'm so proud of her for)

Anybody experienced this from the drug? I've read a few other post and some mention depression, some say their sex drive disappeared, others also said they're fatigued, I've heard birth control can make you view your partner differently (I'm not sure if this is true or not, also know lots of drugs can change your state of mind too) if so does this drug have a similar affect?

Before anyone says it, yes I have communicated with her about it and shes not sure why she feels the way she does either. I just want to make sure i can be there for her and help her in the best way possible if it is something from the drug