The tired number one – playing with third party three-set game is too many times – was slumped following the next group in a fracture on to the ground.
But she recovered to win 7-6 (7-1) 3-6 6-2, sending GB into April’s playoffs.
“She didn’t need to continue if she felt like she can not, but she WIShed to,” Keothavong explained.
“She showed so much courage and determination to locate a means .”
Konta’s deFIAnt win along with an earlier success for the on-form Katie Boulter over Ivana Jorovic clinched the tie of Saturday for Britain in Bath, sending them into their third World Group II play-off.
Excellent Britain – bidding to return to this World Group for the first time since 1993 – were playing on home soil this week for first time in 26 decades and won all of their rubbers across four fixtures in four days, with Boulter and Konta winning all of their singles rubbers.
Konta, that needed to be helped by the end of her triumph finished Krunic, had been spotted lying in a comfort break between the third and second sets on a ground in a gangway.
“I progressively just begun feeling increasingly unwell, feeling lightheaded, shaky, feeling a little bit out of human anatomy,” the 27-year-old world number 3-9 said.
“It gets the better of me by the end of this next set. Uncheck what I really could do, and simply I simply just tried never to dread and do the very best that I could.
“I had to quickly assess what my limits . I strove to zone on the ball and it as well as I could and make an effort to guide the ball as well as potential, and that I managed to do so, which made it difficult for her to do what she wanted with the ballwhich I think is what ostensibly allowed me to come through.”
Keothavong told BBC Radio 5 live:”Going into this game, I knew fatigue might possibly be an issue. It has been a challenging week.
“Every game she [Konta] has played week was incredibly demanding.”
Asked if Konta came close to laughing following the next set, Keothavong replied:”I gave her option.
“She said she wanted to keep going, to give herself the opportunity, to offer herself the chance to secure her game for your team.
“She should be really proud of herselfbecause we all are.”
Boulter said she had been”so pleased” of all Konta, adding:”She worked so hard and pushed through hurdles I am sure she didn’t want to go through to day.”
‘A Very Long Time out’
Krunic said she had thought Konta had taken”a very long time out” but that if she had health conditions then she could not complain.
“It’s difficult for all of us. We all are still brand new,” the Serb explained.
“If she nearly fainted and she had been lying on the ground, then just take for as long because you have to get up.
“Seeing her drama, ” I didn’t see anything wrong with her on the court.”
What happens next?
Excellent Britain await Tuesday’s draw at [12:00 GMT] for the play offs that will offer the possibility of promotion to the next tier of women’s club and Keothavong has one particular WISh.
“A home ,” she said.
There’ll be eight teams at the play offs, including the three winners with the regional events of the week and the four sides that lose World Group II ties this weekend.
It is if they lost the deciding rubber that comprised world number one Naomi Osaka, that britain have fallen four days in the last seven decades last April.