If Bubbles has not been discharged, and has been absent for more than 180 days, then unless she goes back to the Army on her own initiative or can prove she at least intended to (which seems unlikely), she'll be prosecuted for Desertion.
Either way her unit's Commanding Officer has very wide latitude in how to handle the situation. But Desertion is extremely serious, and AWOL is much less so.
If she gets charged with AWOL rather than Desertion, then in the best case, if the CO thinks there are extenuating circumstances (including psychological trauma) or decides given her circumstances that she's been 'punished enough', she could just be handed an Administrative Summary Discharge and walk away. More likely given the amount of time she's been gone, she could get an OTHC (Other Than Honorable Conditions) Discharge, which is similar but revokes any decorations etc and strips her of all rank for purposes of benefits, retirement, etc. There's an outside chance that she could get a DD (Dishonorable) discharge, which has all the bad parts of an OTHC and, as an added benefit, would strip her of 'veteran' status for all VA and retirement benefits and show up on her criminal record. In the absolute worst case, if the CO is vindictive or just plain vicious, she could be tried by Court Martial, get the DD, AND spend up to a year in the stockade. But in the modern US military that hardly ever happens. Usually long-term AWOL accept an OTHC discharge as an alternative to court-martial. Less than one percent of AWOL go to court martial in the last few years, and even if they do go to court martial they aren't very likely to get a DD and/or stockade time. DD is usually reserved for people who did actively bad things in conjunction with their AWOL, like destroying military property, trying to convince others to leave the at the same time, leaving the army to avoid punishment for something else, etc.
EDIT: On reflection, working at an illegal fighting arena is technically a criminal offense that might motivate her commanding officer to press for a DD.
On the other hand if she gets charged with Desertion it's much much worse. The CO has a lot of discretion about what kind of Court Martial to convene, and can limit penalties to as little as 30 days stockade time and/or OTHC by convening one with less authority - but it usually does go straight to a Court Martial and a DD is usually part of the penalties. Although Deserters are only rarely sentenced to more than 6 months, there is essentially no limit to the penalty in a Desertion case. Depending on the circumstances and what else she did, she could be looking at up to life imprisonment.
Anyway, if Bubbles is not properly discharged, then absolutely the best thing she could do for purposes of getting on with her life would be to engage an attorney (yes there are civilian attorneys who specialize in military justice), then use the attorney to contact her unit and handle the defense and/or discharge negotiation. That would guarantee that she'd be charged with AWOL rather than Desertion, because it would show an intent to return.
Of course if CW is not paying her, then she probably can't scratch together enough money to get an attorney to sneeze on her case, let alone argue it to her CO and/or a Court Martial.