Kim Zolciak's Friend Defends Her Against Kroy Biermann After Kidnapping Accusation

Kim Zolciak's family friend, who was accused by Kroy Biermann of kidnapping their son, is speaking out ... claiming Kroy's getting desperate in his attempt to keep custody of his kids.

Elise, who says she's the one who took 12-year-old KJ to the rodeo earlier this month, spoke out on Instagram Wednesday, denying the kidnapping claims from Kroy -- backing up the story Kim initially told the Alpharetta Police dispatcher.

Elise blasts Kroy, saying he's "desperately trying to control every move to ensure he gets full custody and child support so he falsely accused me of kidnapping KJ so he can appear as the only parent who takes the kids out."

She ends her post by asking for people to pray for Kim and her kids -- adding they'll need it to "navigate Kroy's narcissistic, controlling behavior."

As we reported, in the 911 call audio, obtained by TMZ, Kim told the dispatcher she gave  KJ permission to go to the rodeo with his friend, with Elise chaperoning the outing. Sources told us Kroy doesn't trust Elise and had no idea Kim let their kid go with her.

What's more, sources said Kroy asked Elise over the phone to bring KJ back, but she allegedly hung up on him. Kim then told cops Kroy threatened to file kidnapping charges against her friend ... although our sources say he never filed.