The singer said that she had expressed her disappointment at not being given a slot last year.
She told The Sun: "I was vocal last year about not getting one but I'm vocal about everything.
"But to be chosen this year is just amazing. It feels like I've been in the playground and the cool kids have invited me to play with them."
The 25-year-old said that she'll be "taking advantage" of it all in case she never gets a nomination again.
She added: "My label say not to worry about eating the food because everyone's getting drunk, but it might be [the] only chance I get to go to the Brits so I'll take advantage of everything."
Also in the 'Best British Female' category are Cheryl Cole, Ellie Goulding and Laura Marling. Faith insisted that it's difficult to decide who will get the gong.
She added: "Everyone is strong in different areas. I think that, public-wise, my biggest competition is probably Cheryl, industry-wise, Ellie and, critically, Laura Marling.
"It's just nice to be nominated. I don't care what happens now."