Maria de Villota has undergone further surgery for her facial injuries after doctors were sufficiently happy with her progress to permit the operation.
Since the operation, her condition has improved and she is now serious but stable.
A Marussia team statement released on Friday night said the next phase of surgery on her injuries was successfully and promptly completed.
"Earlier today, Maria underwent further surgery at Addenbrooke's Hospital in Cambridge. This was a planned procedure that would depend upon the continued stability of Maria's head injuries, and this morning the medical team were sufficiently happy with her progress to allow the operation to go ahead," the statement said.
"Earlier today, the surgeons successfully completed the next phase of surgery required to address Maria's facial injuries. After the lengthy initial procedure, which commenced on Tuesday and concluded on Wednesday, today's secondary operation took significantly less time.
"Since the operation today, Maria's condition in relation to the head trauma she received has further improved, to the extent that she is now 'serious but stable'.
"Whilst Maria remains acutely ill, this confirms that she has been responding well to the treatment she has received since her accident. Coupled with the significant progress that has been made with regard to her facial injuries, we feel sufficiently comfortable to proceed with a further update.
"On a more personal note, we have taken a great deal of encouragement from today's developments and the rather more positive signs for Maria's family."