Am I overthinking ?

So my husband mom for some reason has become overly obsessed with what I do for some reason… and by that I mean she’ll ask him what I’m doing,what’s my family doing what do I have to say about certain things that have happened for example drama or his decisions on certain things. He has told her to stop probing because he said it’s becoming weird to him too but To me it seemed innocent at first because I’m his third real relationship and maybe she didn’t talk to the other women like that but me thinking like Just a normal thing… I thought she was nosey and that’s what mil do but, here’s the weird things that started to become off putting to Me she would ask what I was eating,wearing what tv shows I’m watching and she would do or get the same things no biggy but heres the kicker… I put locks in my hair recently she did the same!! but what really freaked me out Is she has gotten into my husband Instagram account and started talking to me as if she was him you may ask how I know this he was beside me sleeping and he woke up and seen someone logged in from a different device. Another thing she recently lied to him saying she seen me at the grocery store with a man which is a lie we get our groceries delivered always have since Covid I don’t know am I thinking to much into it ? I think it’s a whole thing where I’m the other woman in her eyes and they don’t even have a good relationship so I’m not sure why she’s doing this