The phrase "as she selects" is correct and usable in written English.
It can be used to describe an action occurring simultaneously with the act of choosing or picking something.
Example: "The audience watched in anticipation as she selects the winner of the competition."
Alternatives: "while she chooses" or "as she picks".
"Who's going to cook this stuff?" He stands by in confusion as she selects precooked chicken breasts.
"I think I'll use the 8s," Ms. Burstyn's character says as she selects the tool she will employ to impose an unwanted medical intrusion on poor Susan.
This implies that, for instance, individual (s^{g}_{2}) can apply for the tax offered to any other agent as long as she selects the same consumption than the latter.
The young mother asked for Mrs. McKirdy's advice as she selected clothes and toys, and walked out with a large number of purchases.
I watched our normally peace-loving little girl chortle like a James Bond villain as she selected the "building-sized" meteor, traveling "incredibly fast" and watched it destroy a Midwestern farm.
Until Citarella's opened in May, finding such takeout gourmet fare in the Hamptons was very difficult, Mrs. Pitkin said as she selected grilled pompano for that evening's dinner.
As she scoured the aisles of the local Bed, Bath & Beyond, armed with a scanner gun and series of lists, some color-coded, I shadowed her as she selected her essentials.
He drove her to her favorite mall, day after day, and stood by as she selected some item to take home which would ultimately not satisfy her so that they would retrace their steps the next day to return it.
Providers play a key role in a woman's decision to use contraception, as well as in which method she selects and her adherence to the chosen method.
I watch her make my bahn mi sandwich -- listening intently as she carefully selects each ingredient.
The movie was especially praised for Julianne Moore's portrayal of Ms. Palin as she was selected to become John McCain's running mate in 2008.
