How do I deal with this issue with my MIL?

Maria

I want to make it brief and to the point. My mil has been staying with me and hubby for awhile now and been a big help helping with my 6 month old son. We get along most of time but the issue I have with her is that with regards to my son she is wants to do things her way and thinks she's right all the time. It's getting to the point where I feel like I can't make my decisons with my own son and she critical it's getting too much. I finally told my husband and she said she's going to talk to her. I been keeping quiet for awhile now and I'm going through alot of stress from losing my job I just don't want to say something to her that I'll regret. I really need help on how I can cope.