I was in a similar position with a large inheritance.
I live in a mortgage free house. The freedom this gives us is phenomenal.
We have decided to invest the money for the dc rather than sending to private school (I boarded from age 7-18, it wasn't always a happy experience).
Because we're mortgage free, have money coming in from rental properties, etc we can afford lovely holidays, the dc go to a really wide variety of after school activities (were finding as they get older these are becoming more expensive with club training 2-3 times a week, equipment, competition fees, etc). But we can easily afford for them to sign up to any extra lessons they want to try. So they've had various music lessons, tennis, trampolining, gymnastics, riding, football, etc.
May I suggest you take a small amount of the money and buy something beautiful for your home to remember your aunt by? It could be a beautiful painting, a sculpture, historic artifact, whatever. But it's nice to have something in the home that brings you joy and reminds you of her.
Get some independent financial advice and don't rush into anything yet.