Your mother would not have been able to open a new account in your names without you being there. If the funds are now in her name only you will have trouble finding out where.
I highly doubt that your names are on the new account. I also think the money may not be there any more, she most likely used it.
if she moved the funds, she moved them into HER name most likely and they are mixed in with her other money - why would she keep your names on them? she has probably stolen that money from you but you are very unlikely to ever get it back
find out what bank she is using.. plain and simple
Ask your mom.