I hope she likes... vs I hope she will like..

[5jj]

A: My daughter goes skiiing every winter.
B: I hope she will enjoy enjoys herself.

Why are there times when only one form is possible? Why wouldn't it be correct to say, "I hope she will enjoy herself"?

In this specific example, speaker A is talking about a regular annual activity. It is therefore inappropriate for speaker B to hope for a future enjoyment. It would be appropriate in this exchange:

A: My daughter goes skiiing every winter. She normally enjoys herself, but things went wrong last year.
B: I am sorry to hear that. I hope she enjoys/will enjoy herself next time.

[bleiva]

OHH............I see now. The new example helped a lot. In the first example, she'll probably enjoy herself, right? However, on the other example, there is a possibility that she might not.
Thank you so much!

However, I've got one last final question. What's the difference between saying, "I just finished reading a book" (for example) and "I've just finished reading a book?" What's the difference between both? (I've heard both... that's why I'm asking). Thanks in advance.

[5jj]

There is no real difference. The past simple is more common with just in AmE, the present perfect in BrE.

[bleiva]

Thank you very much :)