She says that she didn't see the text?

I've been meeting a girl once or twice a week since the summer. Last week we were texting, then when I asked her to meet she didn't reply. When I texted her the next day asking if she got my text, she said she didn't see it and agreed to meet, and we spent Saturday together.

Yesterday I wrote her to see if she wanted to meet this weekend. She didn't reply, but when I texted her if something was wrong she said- again- that she didn't see the text, and agreed to meet this weekend.

What is going on?
She says that she didn't see the text?
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