Projects you don't really want to work on should be chargeable at a rate based on a formula such as this:
Your before-tax wages at your full time job x 3
+ materials for the item(s) in question x 2
+ family and friends hardship fee (you won't be able to spend time with them if you're working on these items) $75/hour regular time or $250/hour for special ocassions
+ d-bag penalty 25% of total from above amounts
average US hourly wages of $21.33 x 3 @ 1 hour per tin $63990
Blank altoid tin on Amazon $4.19 = $4190.00
Miscellaneous decorations, paint etc. at $2.50 per tin $2500
1 hour per tin hardship fee $75000
D-bag penalty $36420
Her total cost to have you produce the tins for her convention is $182100.
It might be more if you have family gatherings in the time frame.
Whoa! I would spend three months crafting 1000 altar-in-a-tins if I were guaranteed $180000+! "Hey, work, yeah...sorry, I won't be coming in for the next three months...I got this really lucrative job offer and I'm gonna have to take it even though the person offering the job is kind of a jerk. Gotta get paid!!"
Then again, something tells me the lady in question would be one of those "You want HOW MUCH for this little thing? It's made out of garbage! I could make this myself if I wanted to. I'll give you $5, take it or leave it." kinds of people.