I saw my mom's friend when I went to the grocery store yesterday and now I want to move back to my hometown.
I am not sure I understand. Why would seeing your mom's friend make you want to move back home?
It means she followed us here and she's so freaking annoying.
Not liking your mom's friend is fine but to the point where she makes you want to literally uproot your life and leave? You shouldn't let anyone have that much power over your decisions. Just try to avoid her or even let her know what she's doing that annoys you and maybe you might find out she didn't realize and can change.
I plan to call my mom and tell her to deal with her friend.
Usually we do not let seeing someone have so much control over us and our desires.