Login to her email and send it for her? I have to do that with my wife. She got "give me your login info or do it yourself, there isn't a third door". I said it respectfully, but meant it. Constantly had issues like that but no longer.
When we first got together I found out she was paying $10K for house insurance, so I set her up with a broker. Got it to $2800. Then found out a year later she never canceled the first, so was now paying $12,800 for it. I dialed the number with her next to me, had her add me as a user. Then took care of it. We got lucky that the second insurance was actually through the same company, so they should have done it proactively. Got a sweet $10K check back.
She was also subscribed to Netflix twice, was paying 4 times what was needed for car insurance.
I used to get pissed, but had to realize she's amazing at some things, but this just isn't one of them. And I am good at it, so it's my thing now, and she lets me have full control over it for that reason.