She said she'll message me, but hasn't?

Anonymous
Had a great first date and kissed.

Last week where we work, I asked if she was free at the weekend but she said she was busy but free weekend after. Day after I spoke to her about mexican food and offered place/date/time but she replied "Yeah I'll message you about it". She was sat on the floor sorting a shelf out and seemed busy though.

Anyway, it's been four days and I've not heard from her but she has used social media since. I'm a little confused as "I'll message you about it" sounds a lot like the "I'll let you know" excuse which usually means they're not interested.. But she did mention being free the weekend after.

Is she playing hard to get or trying not to act too keen? She is a shy girl apparently, but I'm wondering whether to message her tomorrow "Hey, I know we talked about it a little last week but would you still like to get something to eat Saturday evening? to see if she agrees or I get an excuse?
She said she'll message me, but hasn't?
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