Question

"we'll soon be at your station,"I said to the girl (turn into indirect speech)

Answer 1

I said the girl that we would soon be at your station.

While converting directly to indirect speech you need to make sure that the form is also changed.

For instance, say will convert to say as it happens in the past.

However, if the main verb is in the past then change the tense to a different form of past tense.

Answer 2

Answer:

I said the girl that we would soon be at her station