Apologies that I'm too tired to write a coherent edited post.
In order to really be successful there is a lot of work that needs to be done first, which hasn't happened so I'd treat tomorrow as a 'discovery' day, where she and you find out where exactly her weaknesses are, how hard she finds it, and every bit, however small that goes out, is treated as a win.
Perfectly normal to want to sort and see the contents of every bag going out. Work with that, not against it.
All this is ideal world:
Don't criticize, don't judge, be patient, keep it light, and allow her to be in full control, even if things aren't working. Remember she's likely to be defensive, so expect that and be reassuring if needed, but non judgemental is the golden rule.
The condition is massively stigmatized and nearly always assumed to involve grime, which helps no one.
De-hoarding/de-cluttering takes practice. Each start, even if it's a false one, make the next start easier.
It didn't all come in overnight, so it isn't going to leave overnight either.
Encourage the recycling side, but also the idea that chucked is as likely to end up creating power as in landfill.
Anything she wants gone, get it out instantly, not left in her bin/recycling bin waiting to be taken. (potentially back in)
Encourage not looking once things are in bag, remove swiftly, but without drama.
Look up her local dump, recycling centers, clothes bins, cardboard recycling, charity shops, animal centers, etc, and your own. Be her expert on where things can easily go and how that helps others, environment etc. ie glass cullet is needed.
Yes she HAS to get rid of stuff, but while it may feel it has to happen tomorrow because that's when you can be there, actually it doesn't. What has to happen is the conversation is opened, trust is gained, and the knowledge that if she called you to say she had a bag of stuff she needed gone, you'd just ask what time to pick it up.
Remember, the 'stuff' is the symptom of the disorder, and she and you are attempting to deal with the symptoms, without tackling what got her there. Nothing wrong with that, but it does tend to throw up issues.Treat gently.