Is she still interested?

Been dating a girl since late September, and last week she lets it spill that she is seeing/texting other guys while dating me. We have been on 5 dates. She states that she is 30 years old, and says something about her biological clock. So she is dating a couple guys at once, but I didn't ask how many. She says that right now I am by far the best man by miles compared to the other men, and she has only kissed me, and no other guy. This was in late October. In early November I tried to schedule a date, but she was busy, and when I asked to make one one for us she stated she was overwhelmed with her dad being needing a surgery, and missed our phone date.

She then went to Mexico in Mid-November with a friend for a wedding. I asked if she wanted to meet up, and she said needed to look at her schedule on the Nov 17. She has been saying good morning, but last night she said she is now too busy to text at work. Sounds like she isn't interest anymore. What should I do?

Is she still interested?
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