Yes. All things considered a officer in UK would have most likely
(i) Warned her he will arrest. What is known as "good telling off".
(ii) Arrested her and taken her down to station. Probably cautioned her and released.
(iii) Charged her with obstructing a police officer. Possible fine with non custodial offence.
She would not go to prison. No UK court (have some experiance) would through a women into jail for grabbing a officers uniform.
Of course there are exceptions. I am well aware of them. I have had run ins with some - but those are exceptions to the rule. The system is not perfect but is under ever increasing process of tweaking to improve it. I had a allegation made against me once and on hearing my claim that there was no record of me having done such a thing (in defence) a women PC replied "Yes but just because there is no record does not mean you have not done xyz". To which I replied "well you could be the biggest criminal in UK underneath that uniform but there you have not been caught yet". Her colleague suddenly told her "we have to go now" and they left.
I would say that in 1980s the UK police was very easy on Pakistani's and gave blacks hard time. However by late 1990s things began to change. Now they are pretty bad. When I first began to drive in early 1981 my car had no insurance, no MOT, no road tax and looked like junk on wheels. In the quest to explore UK I drove that junk all over. I once pulled over on the motorway and took a leak behind some bushes. When I came back there was a motorway patrol with flashing lights parked behind my junk. I thought that is it. It was dark and the blue flashing lights were dazzking me but through that I saw the officer approach me. The car was full of other hooligans like me. The officer stasrnly asked me what I was doing. I admitted the truth knowing that he knew and honesty was best policy - my bigger problem was the car.
Had he found out about the no MOT, no tax disc and no insurance. He gave me a long lecture about safety, hard shoulders being for emergency breakdowns and pissing before setting off on journeys. I stood frozen next to the windscreen in case he saw the tax disc date. The implications of having car impounded in middle of no where were dire. He amazingly after giving me a lecture warned me to take easy when I join the motorway and check for speeding cars. Next thiing he was gone.
Nowdays I have nearly new car but have earned penalty points and am subjected to more scrutiny despite my middle age. I think times have changed. However despite that I still prefer running into UK police then American or Pakistani police. I am covered with the Pakistani police because I have blanket provided by some extended family being in positions whebn they can press the right switches so I never had any problems in Pakistan. However I am well aware of what they can do to the unconnected or the poor.