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Any fast breathing like this is a real concern, especially if it has started suddenly.
It is hard to say why this is happening without examining her but potential causes from what you have said would include:
Regardless of the cause, she needs to be brought to a vet ASAP.
Though she is not registered and despite Coronavirus, any vet would be able to see her, you just need to ring ahead and give your details.
I would not feel comfortable offering advice for home treatment as she may need oxygen therapy and medication such as antibiotics.
The sooner she is seen the better.
The vet will examine her and may also take a chest xray.
I hope this is all ok?
How is Bubble getting on now?