To be honest, you cannot be part of more than one army, regardless of who you are!! I see no point in trying to join more than one army as you cannot have 2 UN member nations to use in each army unless you are breaking NS rules!!
If she wishes to join the NPA, then she would need to resign from NasiCorps and any other army she is a member of!! I would also request that her UN member nation be made known to the MoD at all times in the unlikely event she did decide to resign from NasiCorps to dedicate her UN nation to the NPA!!
I would also ask that Gaspo and any other NPA members who claim membership in other armies be asked to resign from the other armies if they wish to remain in the NPA!! I see this as a backdoor method of taking over the operations of the NPA and a risk that actions of people under other armies' orders will be attributed to the NPA!!