Urgent 144 hour visa question (UK)

Hi there,
My sister is coming to visit China with the intention of getting a 144hour twov exemption.
Her outbound flight has a transfer in Dubai. So her flight it Emery goes;
UK>Dubai (transfer)>Beijing (stay for 144hours)
Then her inbound goes;
Beijing > Dubai (5days) > UK.

Question 1.
Is it ok that her flight is not direct to Beijing and stops in Dubai for a transfer?

Question 2.
Her 2nd country of visit will be Dubai for 4 days, will that be ok as that was the country she had to transfer at on her outbound journey?

Your help would be GREATLY appreciated 😊