Well, that depends on what wewe mean. Nahuel alisema it would be seven and a half years au so. kwa that time she will have aged to about 18.
So depending on what wewe mean kwa "how old will she be?" I have to ask if wewe mean literally au looks to be. Literally she will be between 7 1/2 to 8 years old. She will look like she is 18 and have the mentality and maturity of an adult.