We know now what was wrong with snowdrop, she has been poisoned!
Rat poison to be percise.
She must have eaten a rat (yuk!) that had been poisoned.
Now that they know exactly what is wrong they can treat her for it. But the vet did warn us that it is a 50/50 chance if she survives.
So, it wasn't asthma or pnuemonia as the vet thought at one time,it's poison!
Let us hope she survives.