OP here - yes, in ES and MS. Why?
This is a concern. Op, do you really not know why?
OP, there may be some general shallowness to your character that needs your introspection: loved ones need assurance that their home life is stable and predictable. Children are emotionally vulnerable, especially to loss ... a loss of someone they've grown close to - such as a parent who is now more absent or a parent's love-interest who they grew to trust and was now vanished from the scene.
Oh please, I think she is perfectly capable of dating and being a good mom. I don't get from her that she is this kind of woman. I think it's ridiculous you would go there. We can't be good moms to our kids if we never ever think of our needs. It's ridiculous.
Not that this relates to her situation, but I am convinced that I am still married and happy after 35 years because we never forgot that our relationship came before our kids. If we were not nurturing our relationship then the kids would be doomed. They are now grown, all went to great universities, never came back home after college, and are now having their own families.