My mom's house is being sold and I would like to take a piece of the bush she said was also at her Mom's house and she transplanted and plant it in my Garden

She called it Bridal Veil -I have googled it and think I found a similar photo and it was called Spirea

The bush has tiny leaves and dark mahogany brown stems with white clustered cascading flowers with a clean aroma blooming in early summer/late spring zone 5

I would like to take a cutting and try to grow this

Any suggestions

Thanks