The following sentences are from a grammer web site Exercises on Sequence of Tenses See, number 7.
I went to see if she woke up yet.
I went to see if she had woken up yet.
I thought both sentences are ok and acceptable, because there can not be much time between "going to see" and "being awake". So I thought both answers are ok.
However, according to the web site, the 2nd sentence is correct one, saying that "*The past perfect is used to indicate that one action had been completed before another action commenced."
However, as far as I know, in colloquial English, the time distance between "waking up" and "going to see" is not such a big thing to be considered. So, I don't think native speakers would be so strict about it and both sentences can be used.
So, just to confirm, my question is: Is there really a very strict seperation between two sentences, to the extent that the 1st sentence would be considered wrong, or is it simply meticulous grammer perspective?