Totally understandable. My wife got her first bike at 41 and got an R6. Many said it was a big mistake but after a year and a half...all is good.
She's also ridden my R1...a TurboBusa and a Ducati 999.
It has a lot to do with maturity and having a level head as well. Your mom may ride a Busa but never really push it and be fine...which some will say is a waste but I say...to each their own and it's her choice and money.
No I wouldn't suggest it but again...to each their own.