I think this is absolutely true in many cases. Very often the interests of women who are working class, middle class, elites, or members of some kind of underclass, will be almost completely divergent.
In so far as they are united, it will tend to be around things very attached to the body, such as maternity care, women's health issues, etc.
Even when we look at things like breastfeeding or nursery care, which you'd think are very concrete, you start to see interests diverge where there are economic class fractures. The model that prioritizes women in the workplace and childcare provision has always been more attuned to upper middle class women's interests, for example.
This is a why, IMO, identity politics are bound to fail. Even with women, who have real, unique, physical needs as a group, other things hugely impact how they affect us. It's been more exaggerated with other identity groupings where sometimes it seems like there are almost no significant interests in common across the group, apart from the interest in not being defined legally and socially by whatever their "identity group" marker is.