The forward was handed her 18th league start and set up the only goal that ensured Iker Dorronsoro s side ended their 10-match winless streak and keep their survival hopes alive.
The game started with both sides aiming to get an early goal to boost their respective ambitions but Kgatlana s pass ensured Sara Navarro netted the matchwinner in the 19th minute for Eibar.
Kgatlana featured for the duration of the tie for Eibar, providing her seventh assist of the season, including 10 goals in 24 appearances.
Besides Kgatlana, compatriot Noko Matlou made a cameo appearance, after replacing Queralt Gomez in the 89th minute.
The South African appeared as a substitute for the fifth time in eight games, having failed to score in two starting roles, first in the 2-2 draw at Sporting Huelva before a 4-2 loss to Deportivo La Coruna.
The 2018 African Women s Footballer of the Year played a significant role in her side s third victory of the campaign as Honoka Yonei set her up to bag the late winner three minutes from time.
Kgatlana s goal was her fourth in eight outings for Eibar as she featured for 31 minutes after replacing Nigeria s Charity Adule. Equatorial Guinea s Ruth Alvarez lasted the final 31 minutes.