Chihuahua health advice needed

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She sounds to be in pain. Have you phoned your vet and discussed her symptoms? They might at least be able to send you some pain relief for her or other medication. Personally, if the vet will see her, I'd get her there one way or another.

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There will be some provision for emergency transport. Your vet may be able to advise on this, otherwise you might need to find a local dog walker. 'Handover' has to be at a distance, but presumably you have some sort of carrier you can put her in, put it out of the door and step back, and the other person can pick her up.

There may be a theoretical risk when she is returned that she has been in contact with the virus, but vets are already going to be very aware of the risks and if everyone involved is careful, wears disposable gloves, etc., I'd imagine that you have nothing to worry about.

Do please let us know how you get on.