MIL issues

Every morning I go for breakfast and leave my newborn with my MIL in my room to get some quality time with her. When I came back to the room to feed her they were nowhere to be found. I looked all over the yard, upstairs and downstairs, only to find that she left the property without even informing me.

I was in a total panic, so when they returned I shouted at her for not letting me know and taking her out. We exchanged heated words but with our language barrier, she believes she did nothing wrong and I am the crazy, rude one for shouting at her.

Do you think that I overreacted?