Complaining owner

I have lived in apartment for 5 years now and since the owner of the apartment moved in next door she keeps complaining. We share a wall. We have stopped having guests over because of her complains. Everytime i have a argument with my husband she messages saying too loud. It makes me so mad. She even complained that my daughter was playing in the bathtub too loud (we share bathroom walls). Just now we had a small argument. It lasted all but 5 minutes and no screaming was involved. She messages that we are too loud. I wasnt even mad before she messaged but after she did it just pissed me off.