Frustrated

So I was at my moms today with my daughter (almost 5 months) and a family friend was there and tried to give her a little piece of a grape I had to tell her no and explain that we are not giving her food besides a little bit of Gerber oatmeal and she seemed like offened or upset that I told her no I’m kind of annoyed because if I wasn’t in the room she would of just done it with out asking me which is really bothering me she’s a good person and meant no harm but I would never give a baby something with out asking their parent first imma gonna have a talk with my mom about it and explain that cannot happen again and my daughter can olny have what I have packed her. I’m sorry for ranting I’m a FTM and some times I feel like people think I don’t know what I’m doing and even tho this is my first baby I was an infant/toddler and 2 yr old teacher for almost 5 yrs so i do know a little bit of what I’m doing