Fed up of friend acting like her child grew up deprived

[Pollylo]

I have a friend who now has a DD that is in her 20s and has secured a training contract with a top magic circle law firm down in London. We raised our girls together so I know what the girls childhood was like.
Friend and her daughters dad were never in a relationship, both very involved in their daughters life though. Neither of them had high paying jobs (Warehouse work and TA). Friend lived mortgage free though from inheriting her parents house.
Her daughter did lots of clubs, including getting several hours of private tennis coaching a week from about age 8. Her daughter did play competitively and well.
The girl went to a Grammar School, often ranked the best state school in the North.
Friend acts as though she grew up on the breadline, and has built herself from nothing. I appreciate she's the first in her family to go to uni and has done very well off that but I'm fed up of her acting like her child was deprived. AIBU?

It’s most likely down to your friend’s personality. If she is a martyr type in the way she thinks, her life narrative will be that she and her daughter have suffered and struggled.
From how you describe her daughter’s life, you can easily see how she could frame it this way. You can also easily see how it could be framed the way you see it.

Curious as to why you feel so angry about this. You have no idea how difficult things were for her financially. Even mortgage free life is difficult depending on your financial situation. I think you may have envy /jealousy over how her child has achieved. Wonder feeling as you do why you are so friendly with her.