Well, at least she got it half right, which is more than most people's nurses do... There's 3 macro nutrients. Carbs, Fats and Protein. Cut one (carbs), up another (fats). Otherwise you will be hungry all day every day, and will get malnourished as well. Have to get energy and vitamins & minerals from somewhere. Carbs make your bloodsugars go up, as almost all carbs turn to sugar once ingested. Protein can also affect bloodsugars, but not as dramatically as carbs do, so you just go moderate on those, and fats... They're a bloodglucose flatline. So fats are perfectly safe for a T2 to go for.
Bit more on nutrition here:
https://www.diabetes.co.uk/forum/blog-entry/the-nutritional-thingy.2330/ and a LOT more on it here:
www.dietdoctor.com . And then there's the forum's own website, it's got loads of information too.
But yeah... Get a meter. It lets you know where you're starting from, how you're doing, and is very motivational, because not only can you see what does and doesn't agree with you, it also shows you the progress you're making.
Good luck!
Jo