I found Highness Rose to be quite similar to AG Rose Absolue, but more linear, less diffusive, and with great longevity as a skin scent. Of the two, I actually prefer Rose Absolue, which seems brighter to me. RA is a combination of 6 roses but based on its smell, I think it emphasizes Rose de mai (a.k.a. Grasse rose, rosa centifolia, cabbage rose.), as does Highness Rose.
If she really loves Rose Absolue she will probably like Highness Rose too. The Perfume Shoppe sells it at reduced prices, see here:
However, it may seem too similar to RA to interest her.
I didn't think Highness Rose smelled much like Sa Majesté La Rose. I believe the latter is more of a red tea rose. I'll leave it to others to comment on that one as I don't like it.
Une Rose is a red rose with lots of darker, earthier notes.
A completely different rose soliflore that I adore is Creed Fleur de Thé Rose Bulgare. Unfortunately this comes in bottles no smaller than 250 mls. See Creed Boutique online (prices have gone up recently) or Parfums Raffy (website still shows the lower pricing on that scent.) This is more of a Bulgarian rose and is liqueur-like with lovely green top notes.