I should note that for Maribel's HP regeneration, she counts as one of the enemies herself in that formula.
So with 3 minions up, her HP is restored to 2,000,000 every time she acts if it was lower. With 2 up, it's 1,500,000, and with 1 up, it's 1,000,000.
Still a good idea to whittle her down a bit if you can do so safely, though. Also, JP wiki loads just fine through google translate for me right now