Я должен был прийти к ней в два час

Я должен был прийти к ней в два часа, но я оставил дома ее адрес, и мне пришлось вернуться; поэтому я опоздал.

Results (English) 1:

I had come to her in two hours, but I left her home address, and I had to go back; so I was late.

Results (English) 2:

I had to come to her for two hours, but I left her home address, and I had to go back; so I was late.

Results (English) 3:

I should have to come to it in two hours, but I had left at home her address, and I had to return to; therefore, I was late.