According to an article in the Geni site, I opened a new, temporary account to import my GEDCOM.
I created collaboration between it and my regular account.
After this, I closed the new account and asked to "donate" the records to my regular account.
However, I noted that all the records (>1500) are now managed by my mother's account instead of me! (she also collaborated with the remporary account).
How can I fix this? It's quite urgent, as my mother will not know how to handle matching requests.