9:20 AM PT -- Law enforcement sources in the U.K. tell TMZ that Emma Fairweather's suggestion that she's been ignored by police investigating the crash or that there's some sort of cover-up happening is simply not true. We're told the Norfolk Police are treating this collision as they would any other, and the fact Prince Philip was involved bears no weight in how cops have handled things. Our sources say the only thing that's unique about this case is that a family liaison officer was assigned to Emma, due to its high-profile nature.

Interestingly enough, Emma claims the liaison officer who was assigned to her promptly resigned ... allegedly because she was asking too many questions and was difficult to deal with. Our law enforcement sources dispute that characterization, saying Norfolk Police reached out several times over the weekend to answer any lingering questions she had, and that she never called back.

Regarding the investigation, we're told that it's ongoing and that any "appropriate action" necessary will be taken by the time it's over.

A Norfolk Police spokesperson tells us that officers plan to take Emma's statement on Tuesday, adding that arrangements to do so were made last Friday.

The woman who was hurt in a crash involving Prince Philipsays she was told to shut her yap and also claims the gravity of her injuries have been seriously downplayed by what she suggests is a cover-up effort by police on behalf of the Royals.

In an interview with the Mirror, Emma Fairweather says she was told by authorities not to speak to anyone following the accident and to expect a call from the Palace ... presumably from Philip or the Queen herself to offer an apology, well-wishes or ... something.

She claims that personal call never came, and instead ... a police family liaison officer phoned, passing on some vague message from the Royals.

Emma also claims the family liaison officer would call to check in on her in the aftermath of the accident ... adding that shortly after speaking with the officer, a report came out detailing her status, which she says mischaracterized her well-being just 'cause she'd been discharged.

Emma -- who was a passenger in the vehicle that Philip hit -- suffered a broken wrist in the accident on Thursday, and says at one point she was circling the possibility of surgery.

None of that was reflected in the reports that came out though, which she doesn't seem too pleased with. Adding insult to injury ... Philip was back behind the wheel over the weekend, without a seat belt, no less.

Police say they issued a warning to Philip after photos of him driving without a seat belt went around the web.