You're not child-oriented, but she is. If she wants to show off her child, then she has every right to, but you have every right not to want to see them. It might be a good suggestion to join some sort of mommy group, either on social media or in person, in your community.

The pandemic probably didn't help in the sense that her child became even MORE the center of her life, since that's all she could really focus on.

Some everyone takes hints. Sometimes something needs to slap someone in the face to get it. Try having a conversation with her and explain that because you don't have children, you have a hard time relating and conversing about these photos. Therefore you don't feel like sharing these photos contribute to your friendship in any way.