The prospect of a return to Menzo definitely does not make sense unless
a) she was serving Lolth's designs all along or
b) she thinks she has the backing of a power greater than Lolth and all of Menzo, which is ludicrous, but then again she is pretty crazy, so who knows.
The goblins are already convinced the Absolute is a greater power than Maglubiyet so Minthara thinking it is more powerful than Lolth is not out of the question. At the moment it is rather poorly conveyed to the player though. Raphael has about as much power as the Absolute judging by what we experience from both ingame.
Also, bear in mind that the PC and his party are convinced the Absolute is an Illithid hoax.
