IMO your post could be unfair as you don’t have the full story.
lets say she couldn’t make the first mile and there was another 15 very hilly/technical miles to go.
advising her to abandon the ride could have been the best option for all.
I used to ride with these guys and I found them to be hugely hospitable to new riders!
I seem to remember lots of information on there website about the rides they put on. They used to rank them ‘easy, medium, hard’ etc and state a rough level of fitness you’d ideally need for each ride. in fact they had maps with all the terrain / info too.
it sounds like she was unfortunate getting her chain stuck…not the clubs fault IMO. you said this was on a road too (so probably close to her car…so he wasn’t abandoned in the wilderness)
Also you have to think about your other members too. what if 20 riders have prepared / travelled upto 2 hours to the ride to find out its ruined by a woman ‘who’s massively bit off more than she can chew’?