There's definitely a long reverb tail on her.
If I were going for this effect, I'd opt for a big stack of vocals (make sure they're tight). Probably HPF all of it. Then send it to a reverb bus turned to a pretty moderate volume.
It helps that she has a very pretty voice in general. I'm...
My main bass is a fretless with rounds on it. When I first strung it that way (probably 15 years ago), it chewed up the neck a little, but once it had cut through the first layer, I haven't seen it get any worse. (I use the cheap strings: usually nickle)
Your tones sound good, but I think the mix is pretty out of balance.
It's pretty vocal forward, especially considering how much the power of the vocal is varying with pitch.
Drums could definitely come up a bit to have more power. (Unless you're going for more of a black metal tone than it...
I can't say for sure, but this sounds dubious.
A condenser mic require phantom power. So you'll either be providing power to the mic from both interfaces (which sounds bad for the the mic). Or only from one (which sounds bad for the signal)
To jump back a fair ways, "When I come around" could be a very good gauge of how much of tone is in the fingers. It's not a super-complex song. You could transcribe it to sheet music and give that to a player who'd never heard Green Day before. Then record them through the exact chain of the...
I'd go with the interface personally. If you shop around a bit and are willing to go used, you can get a decent 2 channel interface for <$100 (which allows them to expand to hosting a guest eventually).
That would also allow them to borrow and try out a number of your mics to see which works best.