I don't think she'd be the kind of woman who would necessarily choose to not have children. However, I think if she did have children she would treat them more like accessories or dolls than she would human beings. I think she would have enjoyed having children only because it meant being able to dress them up and show them off. If anything, Mrs. Allen likes to show off and if she had children she would be bragging about them in a similar manner as Mrs. Thorpe. But since she doesn't have children she's indifferent to the subject because it has nothing to do with her personally (and we simply can't have that!) :)