Whether IGST or CGST/SGST to be charged?

AS is a beautician / make up artist based in Mumbai and having GST registration in Mumbai. She has been engaged by a film company in Mumbai by a single contract for a project wherein she will be working for 20 days at the following locations as per the contract :

1) 5 days in Mumbai,
2) 5 days in Delhi, &
3) 10 days in Dubai

She will be paid @ Rs. 25,000 per day + GST.

The location of the supplier of service as well as receipient of service is Mumbai, Maharashtra.

Q1. What will be the place of supply in the above 3 scenarios?

Q2. What GST will be charged in the above 3 scenarios - CGST/SGST or IGST?