Can anyone emotionally take away my child?

my mil stays with us always try to overtake everything. i m an introvert kind of person talks less. she is just the opposite. i am a new mother with 5 month old kid. whenever she is around she increases her voice pitch so much so that kid can hear her only and no body else. she always show extra love to the kid, motherly love. That apart she imitates my actions with the kid how i make her sleep., how i love the kid, how i play with her. she repeats the actions again and again. i find it very irritating. she has no other work in the world. Can her behavior could influence my child badly? ll my child be drifted apart from me and attracted to this woman as motherly figure. my husband is already a mamas boy. house already belongs to this lady. are my fears unjustified ? or i m just thinking negatively. please help