my sister called my daughter big head

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hi everyone. today I sent a video( on the video she is moping) of my 4 yr toddler to my sister. couple minutes ago I was talking with her and she said OMG ur daughter is so tiny she has so big head, on the pictures she looks good but on the video she is so small with big head. I just said to her, well my daughter she has lots of hair that's why her head looks big and yes she is tiny coz she is not eating well. I didn't know what to say to her at that moment. now I'm alone and thinking about her words I'm getting so mad.really her word are made me so sad. I think she was trying to hurt me coz she is jealous she doesn't have girl she has 4 boys and seeing how my daughter helping me with hoouse cleaning she got jealous. I wanna talk about it tomorrow with her. do u think should I talk or just leave it? if should I talk plz tell me what should I say. as a mother I feel so bad I never said anything bad about her kids