Many years ago, I gave my sister a mostly-knitted sweater for Christmas. I just couldn't quite get it done. I wasn't the addict I am today, so it got worked on when I felt like it, rather than every day.
She got the finished product the following Christmas. And it didn't fit.
Once the pressure was off, I didn't work on it.
This doesn't tell you what to do, but since you are probably more responsible than I am, I'd show her the WIP and it can give you an idea if it fits, at least. :shrug: