September 17, 2014 02:00 PM

Pregnant Princess Kate is being given as long as possible to decide whether she can go to Malta on behalf of the Queen.

Palace aides were hoping to confirm whether Kate, who has been suffering from severe pregnancy sickness, was well enough to head to the Mediterranean island by Wednesday.

But that decision is now due to come Thursday – just two days before she is set to join the celebrations to mark the island’s 50th anniversary of independence.

Insiders tell PEOPLE that Kate, 32, is very keen to attend and her staff are working with her to enable her to go if the doctors believe it is safe for her to do so. She and Prince William, 32, are making a decision on whether to travel, in consultation with her doctors, later Wednesday.

Kate, mom to 13-month-old Prince George, is expecting the couple’s second child, due next year.

Set to be Kate’s first solo foreign trip, it is something of a royal landmark for the future queen and she will be hoping to be able to fulfill her commitment.

It’s thought that another member of the family – most likely William – will step in to take her place if she is not able to travel.

William spent last weekend in Scotland with his father, Prince Charles, and the Queen, while Kate is believed to have been recuperating at the home of her parents, Michael and Carole Middleton, in Bucklebury, about 55 miles west of London.

Experts on her illness, hyperemesis gravidarum, tell PEOPLE that being able to rest is a huge part of making sure any relapse doesn t happen.

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