Long Dress → Tall Space Crown

If mom's going to be an 'empress' then perhaps a sign of status is in order? Let's exchange her 'Long Dress' - redundant, given her robes - for a 'Tall Space Crown.'

Mom's hair shifts almost entirely from 'human' to 'alien tentacle' as her ponytail vanishes and everything other than the bangs hanging just above her brows turns into shiny purple tendrils that glisten in the light. One on either side of her head, and two that sweep from under and behind her ears toward her dress.

The shoulders of her robes become more prominent as well as her hands plant themselves firmly into the curve of her hips and the lower half of her dress parts into... a pair of stockings and a miniskirt made of the same material. There's no more skin showing than before: it's just a shiny gold bodysuit under the 'robe' I guess.

In all of this, she's also turned her head to face the camera over her shoulder and a large golden crown has planted itself onto her scalp. It's simple and geometric in shape, with something like twelve pointed arrows arranged radially outward and a single purple gem cut into a diamond shape at the center.

Alright. So, that went well I guess? Next...

(mature woman, space empress, average build, purple tentacle-hair, giant ass, hands on her hips, tall space crown, shiny gold and silver robe, purse, standing on the doorstep, in our royal family's space station)