These posts about the Marauders never cease to make me laugh.
The only problem is that McGonagall is a registered animagus, so the ministry knows and Umbridge works for the ministry and alongside McGonagall so I'm sure Umbridge knew what she looked like in her form.
Actually "Dolores" means literally "pains" in Spanish. Check it out. By the way, it's a real name.<<<also: dolor in Latin means pain. Dolores is the plural.