The mother of two missed the opportunity to work her way up from 101st place in the world rankings about a month after the greatest success of her career.
Most recently, Maria surprisingly did not play her game against Frenchwoman Leolia Jeanjean at the clay court tournament in Lausanne in mid-July.
Andrea Petkovic had previously returned to the tournament well.
Haller replacement at BVB? Modeste rumors are getting hotter
