Even though ITF definitely wants her back on the court, ITF also knows that too many people are watching their behavior closely. Hence, they would not do something crazy and sign off on a 3 month ban as a punishment. Otherwise, they lose credibility.
When you have 260 million dollars, it should not be difficult to find a Russian doctor who can say whatever you wants (did not Michael Jackson have his own personal doctor who was prescribing him anesthesia to relieve stress :snicker) and it should not be too difficult to predate prescriptions etc in Russia. So, ITF will agree that she did not do it intentionally and cut it to two years from four. As she immediately did a mea-culpa and is not contesting, they would give another year off. Incidentally, the current WADA chief has already said publicly (unlike the Dick Pound, the former WADA chief), one year ban would be appropriate here. So, ITF knows that it can get away from the scrutiny of WADA if they give a year or more ban and they would settle for an year.
But, I am not very sure that Maria and her team would accept the one year ban. If they are willing to accept, it will end with the preliminary hearing. Otherwise, it will go to regular hearing. An incentive for Maria to settle it in the pretrial hearing is that the documents then would not become public. On the other hand, even if she loses one year worth of endorsement money only, that is $36 million dollars. So, there is a huge incentive to fight if they think they have muddied the waters considerably.