Any honest answer here is a rough estimate because the outcome depends on factors that vary case by case, and we are not lawyers. That said, experience with these situations over many years points in a consistent direction.
The four things that drive the outcome most heavily are her criminal history, whether anyone was hurt, whether any property was damaged or lost, and the specific circumstances of the arrest. A small quantity of a Schedule 2 substance and a public intoxication charge together, with no victims and no damage, is a profile the system handles regularly.
If this is her first offense, pre-trial intervention is a realistic possibility. Many jurisdictions offer diversion programs for first-time misdemeanor drug arrests where the person completes a program, possibly drug education or treatment, and the charges are reduced or dismissed upon completion. No conviction, no jail time, and a path forward that does not follow her permanently.
If she has prior history, the picture becomes more complicated and the likelihood of actual time depends on how much history there is and what kind. Even then, a misdemeanor possession charge at this quantity is not typically an automatic jail sentence unless there are aggravating factors or a significant prior record.
The $3,500 bond suggests she is not being held as a major flight risk. Getting a defense attorney involved immediately is the most important step. An attorney familiar with local practices can often get a case like this into diversion or negotiated down before it ever reaches sentencing.