From what I can gather from the posters questions, she does not have a desire for either of her proposed careers to 'rock her world'. It sounds to be that she just wants to be able to do both and earn a decent living.
I dont know anyone's personal circumstances, and I know that what I'm saying doesn't or can't apply to everyone.
but lets be realistic..
renting a space, 3 days a week, and I mean full days, a good 10 -12 hours, at least one late night, should give anyone enough time to build a decent client base, but you have to get the word out there.
I dont mean by expensive advertising, most people have a home computer. A ream of paper and an ink cartridge can cost maybe £15. Thats 800 flyers! Through doors, on peoples car windscreens, in shops. Do a reccommend a friend deal, special offers etc, there is loads of things you can do.
If you are only getting 2 bookings in more than 6 months, then there is something wrong!
Who's says you can't be a dedicated nail technician 3 days a week, I am!! I own a salon now, after 5 years working as a nail tech, and I work wed - fri full days and half day sat. I have 3 kids, do all the paperwork for my husbands business, I am Secretary of the local golf club and am currently working on a project to have a junior golf academy launched in my home town. That easily amounts to a second career!!
If noodles doesn't have anything else in her way, then there is absolutely no reason why she can't do both.
I have a supportive husband and take whatever help is out there, because I'm dedicated to everything that I do.
My family are happy and healthy, I'm tired, but I have a really good reputation. People ask me all the time how I manage it all. I just do, because I want to.