If she's the beneficiary of laundering, there's a whole 'nother interesting story untold here of why she is getting these gains.

If these are accumulated commissions, at a 10% commission she'd have moved $20B already, which would be sort of impressive. I don't know the commission rate, but the job would be well-paid.

If she made £2 billion herself, she would surely be amongst the richest criminals in the world (prior to her arrest). For comparative purposes, El Chapo's net worth has been estimated as being anywhere between $1 billion to $12 billion.