It is solo friendly, by way that you CAN solo past r12 unlike FFXI. That doesnt mean soloing is the best option. It is just better than sitting around in town waiting for a group.
I also see that she gained only 1695 sp from 4 R30 leves at r28. I That seems pretty exaggerated, because I get over 200sp per kill soloing nanawa or nophica leves with my R29 MRD, easily getting over 1000sp per leve. When I solo a R30 Leve at one star with my R37 Pugilist, however, I get around what she get from a single leve.
I of course only solo a leve when it is almost time for leve reset and it is already old from last reset.