Whats's the procedure for Guang Zhou (China) to enter Thailand

I'm from Singapore and will be going to Bangkok with my friend from Guang Zhou (China) for holiday . She does have a newly valid passport and I will like to ask what's the procedure to enter Thailand? We check around and there's a mix of few answers confusing us below:

1) She can apply for the Visa once she reaches Thailand usually without any issues.

2) The airport official at Baiyun Airport may not clear her immigration.

What do we have to take note of? Is there any officials we can check from China side?

Thanks in advance.