Quince is very reasonable, but I’d check the quality for work items. Most people I know shop Quince for casual, if-it-lasts-more-than-one-year-that’s-a-miracle clothes.
My suggestions have all been mentioned so I’m just adding a “ditto”!
Nordstrom shopper was our immediate go-to for my daughter. Her fellowship and responsibilities require professional/more conservative attire. She has supplemented with Banana Republic, J Crew, and Talbots.
She’s also loves to thrift and continues to do so. 
And she wears hand-me-downs from me and her Oma (super fashionable, size 2-4 Oma with a love for Neimans!).
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Not been my experience. Clothing lasts and is very good quality for price. I got a gorgeous work bag that was half the price of anything I could buy elsewhere
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We don’t know if sticking to a moderate budget is important (for many young people it would be and their choices may be different than the older women here).
I’ll throw out J Crew Factory. But it also depends on her vibe! If she wants to wear something after she secures the job 
she should also feel some of her personality in even her interview outfit. If she likes some color don’t purchase a completely black outfit!
I worked in a college of medicine and when the interviewing medical residents would walk by my office or be in a group I always had to chuckle how “the same” everyone dressed. The one I would notice and be drawn to was the one who would be dressed for business but who would have the colored blouse or the non-black flats/pumps and would have something a little reflective of their personality!
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Macys, TJ Max, H &M, Nordstrom Rack.
Nothing wrong with wearing neutrals. My daughter has had luck with all of the stores listed. She typically wears a tall in pants. Many of the stores offer a tall length.
Subscription services were mentioned- my daughter used Nuuly for both work and fun going out clothes and it helped her learn which brands fit her best. In summer she wears mostly dresses and winter its nicer pants and jeans, sweaters and sleeveless tops with a blazer. She never wears a business type suit( works in consulting).
You’re right - nothing wrong with neutrals. But putting someone like me in neutrals only would feel very “not me”. I wouldn’t recommend striped socks or a loud patterned blazer or anything but if $ are part of the equation, having something you would CHOOSE to wear again can be part of the consideration.
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Neutral for the interview I’d think would be safest. One of mine worked in a very conservative company and the understanding was a suit, could be pants or skirt in navy, black, brown or grey. She worked in HR and she said one candidate came in to interview in a fuchsia suit. There was quite the discussion.
She shopped at the time at Banana Republic and Ann Taylor. She also had good luck at the Macys in downtown Chicago. She wore a petite so it was hard to find in smaller store locations. Last year we had a young friend going to law school and my daughter passed on all her work attire that was sitting in the closet at my house.