'RHOA' Alum Kim Zolciak Using Alleged Text From Kroy’s Female Pal in Custody Battle

'Real Housewives of Atlanta' alum Kim Zolciak is using an alleged text from estranged husband Kroy Biermann's female friend as evidence in their bitter divorce ... TMZ has learned. The alleged text was sent from Kroy's ex, named "Bri" to Kim's new…