Is it normal to think it's weird my fiance's mother is suddenly being very nice to me?

Anonymous
Even though I never really had any issues with the lady, she rarely participated in our relationship. I had her on my facebook for 5 years now. During that time, I never once received a Happy b-day, Happy Mother's Day (I got a mother too), Happy Thanksgiving Day nor Merry Christmas from her. It doesn't take 5 seconds to text a simply message and she's computer wise.

Even since getting engaged to her child, now all of the sudden she wished me Happy b-day for the first time ever, involves in longer conversations and twice said ''you're like a daughter''. I'm feeling a bit creeped out by this and start thinking there is something fishy going on. If that's how she feels, why did it take that long?

As much as she's trying to be nice suddenly, I just don't feel that connection. I still view her as a stranger suddenly trying to be nice. I definitely don't see her ''like a mother'' nor best friend. To me it's like I don't really know her.
Updates
+1 y
If we would've been good friends from the start and built all that connection then it would be a different story. I just can't feel the same with someone that didn't care one bit about me (esp my b-day) for years and all of the sudden now is being too nice.
I don't trust that sudden change.
Updates
+1 y
Why should it take getting engaged and the huge possibility of her being a grandmother to suddenly want to get close to someone? I feel that bonding and friendship should've been established before that.
Is it normal to think it's weird my fiance's mother is suddenly being very nice to me?
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