Need advice. I'm not sure if I m to sensative

I m a mother with 2 beautiful kids, and I have a friend who my firstborn is similar ages to her son. However, the thing is, every time she sees my son, she compares him to her son in Inregard to sharing , words ,toilet training ,his behaviours and she always looks at him strangely. She has been trying so hard to fall pregnant, and I understand she might be going through something very hard but it's as if she is envious of my kids . She also always compares the financial situation were in tbh there are things that I can't afford to put my son in such as paid playgroups weekly etc I mean I have 2 kids and the financial situation I m in doesn't allow me to and she knows my current situation however she is on the more weathly end of life and I m not . Sometimes I senses like she repeats it on purpose to try making me upset . Also everytime I see her I come back home feeling like a hopeless mum as if I m not providing for my kids. I have spoken to my partner about it and his perspective is that she may envy the kids and my life but I m not sure what do you guys think am I to sensitive or overthinking things ? Is it me or is it her ?