She looks like a Nic to me too.
As for feeding here is my schedule with my boas, some may consider it too much but I hear of many others who feed very similar:
Babies - subadults (ie feeding feeders up to small rats): every 7 days
Subadults when they get on medium rats: every 10 days
and when mine become adults I plan on cutting it back to feeding every 2-3 weeks to avoid obesity.
Please view my website to see pics of my boas, none are overweight IMO and all are growing up slowly with the occasional growth spurt. I don't have any Nics but I do have a Hog Island "dwarf" boa and three Colombian morphs. My females are growing slower than my male is.
