ITALY TO UK VISIT VISA

I need some advice, please

My daughter is getting married in August and I would like my niece from Italy to attend the wedding

My niece's husband is an Italian passport holder but my niece has just received her nationality but no passport, however, she has been travelling to Pakistan on her Pakistani passport.

I would like to invite all the family my niece her husband and their two kids.

I know that an Italian passport holder can travel to the UK without a visa but what about my niece do I need to send her a sponsorship etc?

Any advice would be appreciated

If she is going to travel on her Pakistani passport, she will need to meet all the requirements that a Pakistani citizen needs to meet to travel to the UK, such as a visit visa.

If she has already received Italian citizenship, can she not get an Italian passport by August?