If she is fine would be correct also rightright?
Possibly, although it is more likely to be used in the context of the weather.
No, 'if she is fine' translates to 'os bydd hi'n iawn
I wrote "if it will be fine". Should that be an acceptable answer?
Where Welsh uses the future tense with os here, the usual form in English is to use the present with the if-clause:
Would 'if it's alright' be acceptable? i would think it should be.
No, braf means ‘fine’, especially in describing the weather