just focus everything on str only.
scroll some agi into str as well and spare some scroll incase she adds some points into int and wis.
She naturally build con as she level so you dont have to worry about her low hp when she rbs.
And she'll have enough sp to do her skills as she levels.
so try to get a 400+sp armlet on her if you can when bursting.
When her str is more than her con, she will start adding more into str instead.
Try to make it a Str>Con>Agi priority, although i dont see the point into adding agi so maybe a splash of wis but not too much.