Sure. You'd just need to:
1) Forge her signature (commit a felony).
2) Hope your forgery is sufficiently accurate
3) Hope that she (intended voter) doesn't call election office and ask about why she never got a ballot (in which case that mail ballot would be deactivated, and it would be investigated if returned)
4) Hope that she doesn't send back a replacement ballot or show up to vote in person (in which case the same as #3 would happen).
But more importantly, instead of showing us a picture of a mail ballot (which could just be from anywhere and is not evidence of material fraud), why don't you answer:
Where are the mass arrests? Trump has been in office for 18 months now. And there have been lots of ambitious Republican prosecutors and sheriffs in office for 6 years since the 2020 election.
And together they've scraped up a handful of individual voters. A few noncitizens vote. A few people voting in multiple jurisdictions.
Hundreds of thousands of hours have been searching. And yet...
What you have is, at best, evidence of a clerical error that yielded no harm.