I know nothing about her. But,
* 'Nationality: Eastern European' = Romanian;
* Photos are likely to be edited and not very representative of the lady you meet;
* £300 p/h for a Romanian who does not even offer CIM, and A level for another £50 on top.
All in all, Diva and other London EE agencies representing this girl are having a laugh. No way I would ever consider paying that amount for a questionable Rom who does not even offer CIM. Maybe £150 p/h tops, then I would consider her.