Sadly I agree. My MIL was exactly the same. Always had her father to do everything for her until she married, then her husband did everything for her. Then when her husband died, my DH ended up doing everything for her. The thing was she was actually pretty intelligent, but had just got into the "little woman" habit where she always had a man doing everything for her. I think she thrived on the attention.
When she "had" to do something, she managed, but she made a massive song and dance about everything, it was just easier for her, firstly, husband, and then, her son, to do it all if she could make them do it. I think also a lot of it was attention seeking.
As for the "learned helplessness", a big yes. She never even learned how to ride a bike, never learned how to swim, never learned to drive a car.
Thankfully, she never went down the alcoholic route, even when at her lowest after her husband died suddenly.
I found it really hard to understand as my own Mum was a self motivated career women, even back in the 50s and 60s, she learned to drive in the 50s before my father, had two different professions after having retrained in the 60s, always worked full time and even had a second job in the evenings, was definitely wearing the trousers in the house as she controlled the finances, decided on big purchases, sourced tradesmen for house repairs, etc. That makes it sound like my father was a wimp, but he really wasn't - he was a manager in his profession, looking after his workplace, recruiting/managing lots of staff, so was happy to leave "the house and family" to his wife, who in turn thrived on being in control of the home and family. I never really identified at all with MIL who didn't seem interested in doing anything beyond cooking and cleaning and didn't even have any hobbies - she often said things like "Fred didn't want more than 2 children", "Fred decided to call him John" etc - clearly dominated by her husband and that never seemed to be a problem for her!