The $5k withdrawal might also trigger a SAR. If it is a recurring monthly practice for her, maybe not. A one-off, it should.
Withdrawals do not trigger SARs. Only deposits that are greater than $10k or “suspicious in nature.” The definition of “suspicious” is pretty much whatever the teller thinks it is. So, if you bring in $2k in cash, smeared with blood….someone is going to get a call.