Well, again, its balance, right? Your mother was doing the best she could.
My husband's father did not give either of his sons a dime for college, but they got to grow up on expensive sailboats and dad owned an airplane. Those were great experiences, but the college debt load for each of them was crushing. And yes, my husband resents the sailboats and the airplane.
Renting an airplane or sailboat once in a while would have given them the experience - and putting the money aside not spent on owning those expensive - but rewarding - toys would have paid for a good chunk of college. His father was not really interested in doing the best he could for his kids - he was interested in having those experiences himself - while he used the excuse "its about the kids" it wasn't.
(They were by no means rich, but my father in law was someone who lived in daily expectation of a large inheritance that when it came - 40 years after he started expecting it, didn't live up to his expectations.)