I'm not going to specify my location (other than not the SE).
In my location she'd have bought her first house in her mid 20s, which would have probably been a little 2 bed starter home. 10 years later she's probably upgraded and bought a 3 bed detached close to decent transport links for when she doesn't want to drive.
She's now paid off her mortgage, or only has a small amount left to pay since she's not had to factor in childcare costs for her working life thus far. She therefore has a reasonable disposable income and has a bit put aside for a rainy day.
I'd like Betty to have a small dog, but being on her own and working, she more likely has a cat. Probably a Persian or a Siamese.
Betty has plenty of spare time which she uses on her hobbies. She probably likes to keep fit and active, so goes running almost daily. She also likes taking care of her looks and has her hair done every 6 weeks or so, plus visits the beauty salon for nails and waxing once a month. Betty is generally slim and attractive.
Betty doesn't really like cooking for one, so largely lives on M&S "ding" dinners which have been reduced in the sale. She eats out or gets takeaways too often also as a result of not really enjoying cooking for one.
Betty might be heavily involved in volunteer work in her spare time and this plus her hobbies take up most of her spare time.
She probably holidays with her hobby group mainly in order to avoid going on holiday alone.
Betty probably has a FWB or casual relationship she sees a few times a month, but having lived alone for her entire adult life is not interested in taking things further. I don't think Betty would be into online dating and enjoys her lack of commitment, though she probably gets lonely and wonders if she will regret her decision not to have children.