Diagnostic criteria: restricted, repetitive behaviours - what counts?

I am only at referral stage with my almost 8yo daughter currently, and have just finished filling in the initial forms with all of the current concerns ourselves and the school have.

Thinking forward to assessment, I am just wondering what is considered when they assess restricted and repetitive behaviours? Our daughter does not display any obvious physical manifestations of this in the way of repeated movements, however her thinking and topics of conversation can be very repetitive. One of the problems school have noted is that she often gets stuck on particular negative thoughts or situations, and despite others attempts to offer solutions she seems determined to repeat the issue, with little attempt made to 'work through' the problem. I feel this, and her hobbies/interests are the only areas where these restricted criteria are met.

My question is, as a high functioning individual, will that be enough to warrant an ASD diagnosis? After reviewing the information we have gathered for referral I think we definitely have enough evidence to fulfill the social/sensory aspects, but am unsure of this particular diagnostic criteria.

Can anyone who has been through the assessment process shed any light?