How much taller do you reflect on my sister will acquire?

She just turned 12 (Dec. 4), she's 5'1", she have not gotten her period all the same. Her dad is 5'9", her mom is 5'5", she has a quick metabolism (if that changes anything) and she's 88 pounds, near that information could you predict her adult increase? she want's to know...thanks! she could be 6 foot soaring for all i know. young girls change so much within just 1 year. I know i did. I grew resembling 3 inches in one year--its implausible how unpredictable it is. Just wait and see you will probably grow at smallest 3 more inches.
5'4 or 5'5