Beginner Ladies' Club Recommendation?

[IndyBonzo]

I would like to get some new clubs for my 16 yo daughter, who is a good athlete and has a strong aggressive swing, but has not been playing golf for very long.  

After some research, I am not entirely sold on buying her a complete single brand set, as I suspect (???) I could get better quality buying used clubs on more of a piecemeal basis, and doing some building/swapping shafts/etc. as needed, but I don't really know.

I also question whether she should hit a ladies' flex in irons given her strong swing.  Maybe senior flex or even A or R flex.  (I wish I had her driver swing speed, which would answer that question, but I do not.)

She is 5'3" so I suspect typical ladies' lengths (or even shorter) would work for her.

Any recommendations from those with experience in this arena would be appreciated.