Using a Gentile on a holiday – no longer in practice

In the SD
Hello Rabbi,
I wanted to ask about the fact that my grandmother is very elderly (96+), and they want her to do the Seder on the holiday with the family, but she is no longer able to sleep outside the house, and therefore, there was an offer to pay in advance to an Arab taxi driver to take her there and back on the holiday. (And let’s say he opens the doors, etc., etc.).
Is this halachically permissible?
The assumption here that she would be quite disappointed if she were alone in her home is fine.
PS
(It’s not actually true anymore, because I told the family that it’s normal and that it’s forbidden (and especially since I doubt whether the grandmother wanted it that much…), but after attacks from my extended family on me… I wanted to ask if I was wrong.)