I don’t think you giving up your riding is necessary – 1 night a week is nothing!
We have a 16 week old girl and I still train most days.
Definitely get her to go to some of the free mother and baby classes. She’ll meet loads of other mums in the same position. My other half has something most days with other local mums which keeps her busy and gives her a very valuable support group to compare baby tactics etc… I think she would be really struggling without this.
If she’s breastfeeding and nipper won’t take a bottle then it’s going to be tough as there’s little escape for her.
I did get my other half out for a bike ride whilst we left the little one with my mum for a couple of hours and she forgot about the baby for a good hour and was just her again…
Obviously being a girl and therefore mental she then felt very guilty about forgetting about the baby and this upset her…. Can’t win!!!!!!!!!