It doesn’t have to do with her wealth (although that does give her better lawyers). The justice system just moves slowly. Many people spend upwards of years before going to trial. This is nothing unusual.

And getting married while awaiting trial is allowed because the accused hasn’t been convicted (hence, accused). (see edit below)

What would be unusual is for the charges to be reduced or even dropped. But, as it stands, she’s facing 20 years in prison. Possibly more after this incident.

EDIT: I wasn’t saying she wouldn’t be allowed to get married post-conviction. I was saying that, even if the right to marriage was removed when convicted, she’s still not convicted.