Low ponytail, parted in front, with a barette or flexi or black liga. Not a scrunchie or anything like that; a ponytail can definitely look non-casual as long as you present it that way. I ponytail for job interviews, etc. as a way of making it look more conservative and 'done', you should be just fine.
So sorry you had someone close to you die.
2c / C / iii (FIA)
Med-Coarse, LowPorosity, NormalElast (LCLF)
Wash: DevaCare Low Poo
Detangle & Rinseout: Walgreens or Sally's Conditioning Balm (always)
Leave-in: DevaCare OneC (budget choice is GFTN)
Style: ReCoil & DevaCare Arc Angel (budget choices are HESMU or Got2BSpikedUp)