On hard I think she only gets one of her abilities, the one of hrer abilities so probably the army replacement one and not the save her life one. Maybe she should get both on hard?
I think adding another queen ability isn't necessary for hard. I don't know if this is the case for anyone else, but I had to cheaply use the queen ability's free respawning of ants to win the final wave on hard. I had to place down army ant major tiles as I got the food to build them, without any concern of saving food for more respawns. This would allow me to get more army ant majors spawned when the queen ability was activated.
With the enemy colony, it is the easier part of the level, but I think if they had a queen ability and made a huge push with their army, they could take control of the middle again, get food (the food drops get pretty significant later on in the level), and rebuild. Probably best to leave that second ability for insane.