I think she is trying to covertly defend herself and her choices, because ultimately there is likely a part of her that is disappointed she is 34, single, childless, whatever. I know from my own experience (no kids) and from single friends that being in your 30s and not having the typical husband, kids, dog, mortgage and National Trust membership can alienate you from your peers. I think she feels this, and she is trying to make it clear that she chose this, before anyone dare judge her.
The funny thing is, of all the things to judge her for, I’d never care about her being mid-30s and single etc. I doubt many of us would. I admit I do judge her and find her strangely fascinating, but really for things like her narcissism, her lies and grandstanding, her obsession with how she is viewed by others, and how it makes her reinvent her narrative a lot, all that armchair psychology stuff.