Girls, she introduced me to her mother but she is having a cold behavior, what could it mean?

We had 2 dates and on the third she brought her mother with her and we had such a nice afternoon together!

She said her mother liked me a lot, I even met more relatives of her when I dropped them home.

But she is having a cold behavior the last 2 days, she even said she missed me and wanted to meet me but she cancelled saying she was tired from work. Next day she just didn't talk to me at all.. when we text she takes hours to reply.

And we go out in public holding hands, kissing and hugging, it is all so confusing.

Girls, she introduced me to her mother but she is having a cold behavior, what could it mean?
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