you mentioned she texted you. I would text her and ask if she has moved out completely and inform her that you need the keys. She will respond in one of several ways:
1. Not respond at all. Continue with the sheriff schedule to put her "junk" outside. Do not remove any of her stuff or change the locks prior to the sheriff being there with you.
2. She says that she is almost moved out but has a few things to still pick up. Continue with the same action as number one. Do not remove or change locks until the sheriff is with you.
3. She has moved out completely. Reply that you still need the keys. If she comes up with excuses...lost them, not sure where they are etc, get her permission in text to change the locks because she confirms that she has moved out and nothing of value was left.
4. She has moved out completely and will meet you with the keys or left keys locked inside the unit.
The keys being handed over is a legal line in the sand that answers to a judge on whether the unit was truly moved out of or if the tenant was forced out by the landlord through illegal means such as changing the locks.
So in other words, have they keys in hand or text with her confirming she has moved out completely or have the sheriff. Anything less and you will be open to a lawsuit that you will probably lose.