Dottin, the West Indies allrounder who helped to secure the Women's World T20 title last year, suffered multiple cheekbone fractures after an on-field collision with team-mate Laura Harris during the Heat's match against Melbourne Stars on December 28.
She remains an outside bet to return to the competition at a later date, after insisting "all is going to be fine!" in a post on Facebook.
"Eye socket and eyesight is fine, jaw and teeth fine," Dottin wrote. "I am out of hospital now, recovering before a specialist appointment with a face surgeon Thursday. At this stage it is believed I will require titanium plates to fix the issues."
Winfield, who captains Yorkshire Diamonds in the Kia Super League and can also keep wicket, had been travelling in Australia when she received the call-up.
She averages 23.76 in 18 Twenty20 international matches for England, at a strike rate of 112, but shot to prominence last summer with an ODI innings of 123 from 117 balls - and an opening stand of 235 with Tammy Beaumont - against Pakistan at Worcester.