I can't offer you advice on your relationship, I can tell you how an addict works though, as I have been one for 24 years.

The fix comes first, if your not thinking about it, your working out how to get it, where to get the money, then your feeling guilty for doing it. Then you want to push the guilt away and the cycle starts all over again.

It's first thing you think about, when you wake up, last thing that you think about at night.
When something jeopardizes my chance at my security and ability to get my fix, I will agree to pretty much anything.manipulation is also second nature to addicts, lying, and being secretive.
This doesn't mean we are necessarily vindictive or nasty, but selfish...definitely. And very, very low impulse control.
Most of us are running from something, but there is no fixing the underlying problem until the addiction is dealt with.

If any of this sounds familiar, then I think perhaps your focus needs to be wether she can accept this and focus on fixing this first. And if you are in a position to see this potentially very difficult period through.

The other said thing is often it's not until we lose everything we realise there is a problem.

I hope very much that this isn't something you will have to contend with, and that it's more her insecurities at play.

All the best, take care.