advice please. Im kinda losing my head

My partner and I have started our small business. We do delicious vegetarian food and so far we doing decent. I have severe social anxiety and i cannot work. Having this business helps me alot because i feel i am doing something to earn money plus i do what i love which is cooking. We decided that when we marry he will work and i will work from home doing catering. My partners mother has other ideas. She is furious with me working from home and keeps telling my partner i have to go to work . She is really stressing me out. I am so focused on this business and for the first time i feel i am something. She makes me feel so bad bcause in her mind a real woman works and pays bills and even tho i work so hard she doesn see it. She thinks i load of her son and thats nt the case. She is stressin me out alot. What do i do???