Foster attended Edwardsville High School and played club for Metro United Soccer Club, which is now St. Louis Scott Gallagher-Metro.
She is currently a senior at University of Louisiana-Lafayette. Her freshman year (2008) she sustained an injury at the end of the pre-season which forced her to sit out the remainder of the year. She had to redshirt the following year due to the same injury. Her sophomore year she started all 20 games on the season. Foster anchored a defense that set the school single-season record with seven shutouts and tied a single-season record by allowing just 28 goals. She also scored a career-high three goals, all at home, vs. Lamar (8/29), vs. Arkansas State (10/8) and vs. La.-Monroe (10/29) Took 11 shots with seven being on goal. Her junior year she saw action in 10 games, starting in six contests while Recording one shot on the season, which came in a 4-0 victory in the season finale at ULM (10/28).
Foster earned 12 player of the match votes in the Sun Belt Conference (2nd highest vote getter) and was in the top three candidates for freshman of the year. She also was name Athlete of the Week by StLsoccer.net.
Coach Lindsay Kennedy-Eversmeyer, speaks of Fosters commitment. "Fire & Ice SC is very lucky to have picked up such a strong, dedicated player as Gayla. By dedicated, I mean, she has had like 4 ACL surgeries and she is still growing strong. I like Gayla because she is a versatile player. While her main position is defense, shes also is very offensive minded. Shell attack out of the back and if I ever need her to go up top, she could get the job done there as well. I can pretty much put her anywhere. Shes definitely going to be a force to be reckoned with on the field!