But I don’t think it’s helpful for strangers to give her a telling off for still feeling things for her ex-partner this soon after the breakdown of the relationship.
Literally no-one is doing that. No-one is saying she shouldn't be feeling love for him, or that it is easy. Everyone (well most sensible folk) is saying she must cut contact though, for her own sake and that of her child - and also him because its giving him mixed messages and just dragging it out.
I think the people who are being 'there there, its understandable you are still in contact, you are doing so well, do things how you want at your pace your own way' aren't actually helping actually. Its what OP wants to hear, that she can still keep that contact with him and thats ok. Its not. Shes still in love with him, grieving the loss of the relationship, broken hearted and probably tempted several times a day to reverse it all and have him back to stop what is likely a gut wrenching pain in her heart. Of course she is! But she does not need to hear that its ok to keep that string of connection between them. She may desperately want it, but she very much does not need it, and its keeping the pain there for longer. Its cruel to her and to him, and its blocking healing.
That's not telling her off, that's trying to help a fellow human reduce their suffering that we can all plainly see she is now inadvertently exacerbating for herself. I truly believe that everyone reading this who feels like me is, like me, full of empathy for her.