What school?
Most give a # and may say if someone has something different to add you can submit another etc.
On essays, optional means do it. LORs is one place where the minimum is enough.
What new light will a 4th and 5th person add ? Even a third given that person is often non academic - a coach or band leader - it could add perspective.
Many schools, of course, don’t accept LORs at all.
Which is requesting or offering five ? It won’t sink her but it’s likely of zero impact. Some may say can’t follow directions though.
If you give a school name or two we can assess deeper.