If she received the money from her boyfriend wouldn't he have that? If she showed customs that form it might raise more questions because she says it's her money but with his name on it.
We both know she did something illegal
The GUY wins money at casino
Hands her over a large amount of cash
She tries crossing border claiming her "boyfriend" gave it to her but when they search her cell phone she does not have a single picture of this guy
This also is not the first time she has had a "boyfriend" (comment about hoping this one sticks around by CBSA) as she has done this in the recent past
My take? She is a pro
She was paid to travel and take care of someone on location
She tried bringing money back this way thinking to disguise her wages as casino winnings