Hello,
This all depends on which marine pros she has. If she has the ic loop version, they probably should not be used on anything above a 125, and if you have sps it needs to be at the top.
However, if she had the orbit marine pros with the 60 degree lens she can grow clams, sps, anything she can throw at those lights. My tank is a 240 and is 34 inches tall, and using a ly-core 1500 I have had accurate readings of 200 par on the sand bed. I currently run them at maybe 30% whites and is too strong for most of my sps, and my maximus clam does amazing.
These lights have been absolutely amazing and my growth rate has been quite a bit better than using hydra or Ecotech.
The lights will absolutely burn up any coral and clams (the one I do have really loved the light intensity they produce). Depending on size of tank, if you use the 60 degree lens you will need two to cover front to back. I would highly suggest finding the critical angel, and sin/cos of the angel to find the best spread on them.
These pics are of my lol annoying anemonie living on top of my holly wood stunner. The tank is almost a year old and that stunner has been trimmed twice already and grows like a weed. Same with the birdsnest and some of the other sps. So they will absolutely grow clams and sps and (maximus clams which is what I have). My tank is quite a bit deeper than a 90, it’s actually 34 inches tall. (I have to drown myself to clean the bottom), but par is not an issue with these.