It will be just fine. Her standards and yours are at different places.
I've been observing my friends over the years, almost all them sit down to their sewing machines and turn them on and sew. In my opinion, the default stitch length is always too long but they've been doing it that way for years. In my case since quilting is basically all I do, I changed the default length so I don't have to remember to adjust.
Another one of my friends uses a horribly huge stitch width... must be 6 inches per stitch. She always has problems with her seams coming apart at the end but she is happy with it because she can take out mistakes easily. I'd rather have a harder time with a few problems and have nice tight ends myself, but that's the way it goes -- we each have our style of doing things.