It was reported that Sarah Ferguson, previously married to Prince Andrew of York, and mother to Princesses Eugenie and Beatrice, was deeply offended having not been invited to Prince Charles’s “inner sanctum” bash for Harry and Meghan. As such, her attendance at the royal wedding was uncertain.
Whether or not this is true (the claim has not been confirmed by the palace) is unknown - as is whether or not her invite to the royal wedding was a last minute one (rumour has it, it was Prince Harry who insisted she be added to the guest list).