أَحْسَنَ اللَّهُ إلَيْكم My wife and I do 1to1 arabic classes online with a male teacher but we do our sessions separately I used to stay at reach so I don't leave her alone with the teacher, but nowadays I can't due to salah The ustadh is serious and we're really benefitting Is this sinful for her?

Ustadh AbdulAziz al-Haqqan

I instruct against this, there should be no khalwah between them. Look for a sister to teach her or choose a different time.