score:6
I don't think the Family Visit Visa is an option for 2 reasons, based on the published eligibility requirements.
Reason 1: Ineligible family relationship
The list of people who can be visited under a Family visa is given as:
A cousin is none of those things.
Reason 2: Ineligible residency status
The family member being visited must be one of:
You're not a British citizen, and I don't think being in the UK on a short-term visa yourself counts as being "settled in the UK". The other 2 options are presumably not relevant either.
Upvote:0
https://www.gov.uk/browse/visas-immigration/short-visit-visas
The Family Visitor visa is intended for visits of 6 months. If your cousin is studying in Germany I suspect she won't be coming for that long.
If it's just a simple visit then General Visitor visa appears to be the correct one.