tianni stratton suffered physical and verbal abuse , her mother claims .
on one occasion the girl wore sun cream to make her skin look ` english '
mother tracy says tianni is so traumatised she is afraid to leave the house .
she is suing local council over claims it ignored complaints of bullying .
tracy is trying to raise £ 6600 for an autism service dog for tianni - more information may be found here :  letsgofundraise-uk.com .