Mother of my cousin

So this may sound pretty petty but I'm just looking for honest opinions. The mother of my 2nd cousin deleted me on fb and I actually really wanna know why or what I did? I know it's not a huge deal to not be friends with someone on facebook but I am her daughters cousin so I'm really curious as to what her issue is. I realized she had deleted me (don't know how long I've been deleted for) and I tried to send her another request and she denied it and made it so all I can do is message her...but she's still friends with lots of my other family members. Am I taking this too seriously? Not really sure what I ever did to her...should I Facebook message her and ask her?