Someone’s sister wants me to help her learn English but I don’t want to?

I was abroad and hired a tour guide. He told me his sister wants to emigrate and improve her English. He asked if he could pass on my number to her and I said yes because I felt rude to say no. So she has texted me but I don’t really feel like helping her ( sorry if that sounds bad, not trying to be rude to her). Should I just ignore her messages?

Someone’s sister wants me to help her learn English but I don’t want to?
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