Need opinions

Okay so my daughter is 4 months olds and has been exclusively breastfeeding since birth. (Well breast milk fed I guess. Anyways my mom always watches her when I’m working but today her great grandma was watching her (her dads grandma) and she feed her baby food for the first time without asking me first. It upset me to the point of tears. Am I’m being over sensitive and over reacting or am I right to upset.l?