Mental alteration on it's own does not count as a process, which is defined as a physical alteration or change of a female or used to be/will be female. Since female to male stuff is a bit rarer, it's easier to just say that a process is a physical alteration of a female in some way, either age size breasts hair so on. There's aren't any rules against it, but unless it's paired with a transformation you're going to have a hard time keeping it here. Bimboization, on the other hand, does count as process because it includes a physical transformation along with (in most cases) a mental change that lowers their intelligence to a common number found in a sack of door knobs.
Hope that helps you.