There is no point - if she's not keen, she won't practice or if she does so under duress, she won't really progress. But if you are carrying on to the end of term, sitting in the lessons will help a bit - even if you don't play, the scales and songs she is playing at that age will be incredibly simple and you can help to remind her what the teacher has said
My DD had piano lessons for about 18 months from ages 10 - 12 - she loved playing but we really struggled to get her to practice. She said she didn't want to continue but was close to doing her grade 1, so we agreed that she could stop after the exam.
I could already read music as I played from the ages of 7 - 14, so I could help her with the basics. I wish I'd carried on now, but I had no real natural talent for it.
My DD still plays uses apps to learn modern pop and rock songs she likes, but will do it on her terms and having the basics of that 18 months of lessons helps. Sometimes she practices for hours, sometimes she doesn't touch the piano for weeks.
If she is reluctant, it may be worth stopping for now - if you have the instrument she can always start lessons up again later, or just use the online apps to learn.
You could try using the online courses to learn together to learn the basics too - that way, if she does want to pick it up again later you could help her out.