Lila was out walking to the library, in her full magical-girl dress because she likes it, absent-mindedly dowsing for witches even though she's not totally sure she's up to take one down by herself if she finds one.  She hasn't been a magical girl for that long, and she's already had more than her share of disturbing revelations... enough that she's already subconsciously trying to anticipate what will happen next.

Still, she wasn't anticipating opening the back door of the library and finding a strange bar.

But she pats down her poofy grass-green skirts, steps in, and looks around the crowd for someone who might be up to explain to a new magical girl what's going on.

Well, that's quite nasty, isn't it? Where does she keep her self? It looks painful, which means Lucinda knows she's needed here, so she says:

"Oh, you poor thing! How can I fix that mess you call a soul?"

Why yes, her soul gem is rather dingy at the moment.  It's been a while since she's found any witches.

"I'm not sure you can do it, unless you somehow have a grief seed."

"Grief seeds? No, honey, I don't need to waste my time on that. I'm a fairy. I just put together the spell in my head, and I make it happen.

How did you get it so dirty in the first place?"

"Oh wow, you've got an innate magic for soul-gems!?  Is there any way I can get that?"

She was guessing there was a lot more magic in the universe than she knew, or the Kyuubeys were willing to show her, and she's really happy to be seeing a bit more of it now.

"And that gunk's from doing magic, mostly - though some of it might just be from feeling unhappy.  But I'm a lot happier now to see you!"

"It looks like you would just need to stay happy, and I'm great at making people happy. How would you like to be happy all the time?"

Part of her likes the sound of that...

"But Jenny said doing too much magic also hurts it?"

"Not if you're me, honey. Do you want my gift, or not? Opportunity knocks but once..."

On the one hand, she wishes she'd been able to pry more facts of the Kyuubeys, and maybe it would've helped to pry more before she'd accepted their contract.

On the other hand, she doesn't want to pass up this opportunity to see more magic!

But she'll risk a question.  "That's great!  But does it do anything else to me?"

"It does whatever the gift does. I don't waste my magic, girl- the point of a gift is to give. Always being happy, right? That's what would make your life better?"

"Well, not being unhappy, so yes..."

She isn't sure that's the best word, but she can't think of a better one at the moment, and it's not wrong.