Chicken and the egg syndrome

[colloc]

Sorry but I am struggling to get my head around a few things.
You start a relationship with someone from another country outside the EU.
You very quickly realise that you are ideal for each other and would like to be together
As with any relationship you need time to get to know each other and only time will tell if your really are compatible.
The UK authorities don’t really recognise a relationship of less than 2 years and I can understand the logic in that, so with the current visa guidelines a visitor shouldn’t spend anymore than 50% of their 6 month visa in this country.
I am trying to work out what to do next, girlfriend will soon be coming up to the end of her latest visit.
This is her 2nd visit having previously been here for 3 weeks and now 4 weeks this time. So far she has spent 7 weeks with me, so how long should I plan for her next flights? I guess she only can stay another 6 weeks in the UK on her current visa?

[Casa]

How long did your girlfriend state on entry that she intended to stay in the UK on this visit

You've slightly misunderstood the visitor visa rule. A visitor shouldn't spend more time in the UK in a 12 month rolling period than they are spending in their home country.

[colloc]

She has stuck to the information given on the clearance form (the one you fill in during your flight) First visit 3 weeks, Second visit (still here) 4 weeks.
When should she apply for a second visa?