Hi,
Since she would be kept in a pot, 3 trunks should be enough, unless you want to propagate that tree .
If you want to propagate her, add more dirt up to the top of the pot, and the stems will make roots up on each stem. Once rooted remove all except the 3 bigger .
The green root-sucker, if you don't need it, I would remove it asap .
Depending on your winter storage space ...I would remove the buds going inwards and let the buds going outwards develop.
The choice is yours :) .
You could well wait until July and act by then .