My mother in law is crazy!

So, my MIL has been asking me what my husband of one year and I plan to do on our anniversary for weeks now. She has been more concerned about it than I have been. I am a student who works full-time and have not had the ability to get anything planned just yet. Anyway, our anniversary happens to be on Monday. I found out tonight that his mom asked him if he could do something for her Saturday so that she can go on a date. FYI- she's going on an anniversary trip next weekend. I know she's noticed our anniversary is on a Monday which happens to be my last day of school (so we can't go out). Obviously we would celebrate Saturday. She has now put on facebook things along the lines of "Oh, my baby loves me so much. Agreed to help me instead of take his wife out for their first anniversary." I am not a jealous person and know it has been hard on her to have him out of her house - but this is pushing it. She thinks I am too stupid to see what happened. Opinions? Will this jealousy she has eventually go away?