well guren, hanabi,hinata, pakura mei and kurotsuchi are only female kekkai gengai ninjas so guren or hinata are my top choises (more leaned towards guren) as hinata has multiple variations so there is 1 to choose. (hanabi was recently free, mei has sb so less change, pakura and kuro both are common ninjas (unless oasis made their own version of those 2 ninjas what is very unlikely)

so i think its 70% change that its guren