AITA for not letting my friend borrow my tablet for a long trip?

For context, I have a tablet that I don’t use except for when I travel. A friend asked if she can buy it to which I said yes, then a week later she asked if she can borrow it instead for her 3 month trip.

I said no, because I am planning to go on a trip as well, so the time she wants to borrow it is the only time of the year that I dust it off to use it.

She is saying she is upset that I was willing to sell it but not lend it to her.

Am I the asshole?