She was being really selfish. Unfortunately there are plenty of them on trains which is why I generally have to avoid them or spend a lot of money for a first class ticket
@dianthus101 If you have ever travelled first class you would know it does not guarantee a seat all to yourself. Commuter trains have a single carriage (often occupied by employees of the railway as they get it free) and on longer journeys the seats can be single (just) or in pairs.
I'm actually shocked at the comments here from selfish people.
I am sure that the seat the OP 'chose' was not the only one free on the whole train.
She's chosen to be affronted.
Anyone with some understanding would have thought the women wanting to distance had a genuine reason, and moved on to find another seat.
Speaking from experience, my DP found train journeys very hard all through the pandemic when he was travelling for treatment. He wears a proper mask and distances himself.
It's not as simple as 'going by car' if you've had surgery and can't drive, or taking a taxi. Taxis are worse as you are in a confined space unable to move around and the driver may well be infectious.
If someone objected to my sitting next to them I'd assume they had a VERY GOOD REASON and find another seat.