There has been some extremely good advice given here...healthwise, legalwise, etc.,.  
What I'm picking up from SarahFair is that she is moderately intimidated by these "neighbors".   That is very understandable in today's society...anarchy is on the rise.  I can't help but to think of the Beatitudes in situations like this.  
I think she stated in an earlier post that she didn't have insurance.  I don't know what her economic status is, and in our country's deteriorating social and economic environment I won't even wager a guess.  I know that in the past an emergency room couldn't not turn away a person if they couldn't afford treatment.  I know that this country has several million illegals that get free medical care and more money from the government than my 79 year old MIL gets (her SS check is less than half of what many illegals get and she worked *all* of her life).  She could go to the ER, tell them what happened and tell them she can't pay a doctor, ER, hospital bill.....see what happens.  Might even try this at a "clinic".
It was also stated that the "neighbors" apparently don't have the resources to pay any medical bills that she might incur.  It sounds to me that regardless whether the "neighbors" had the resources to cover her medical bills that they would probably be hesitant to do so.  Do they own the house that they're living in?    If they don't, then the property owner/landlord can be liable for damages.   It's just a thought and up to you whether you would want to pursue it from this angle...but, it could possibly cover your medical bills *and* might actually encourage the property owner to find a new tenant for that property.   If the neighbors own the house, well it would definitely be more troublesome....but, liens have been put on income tax checks,  liens on houses, vehicles have been impounded, etc.,.
It's not that you "want to get even" or anything, but rather that you have been wrongfully injured by them (their property) and that you are (I hate to use this next word) entitled to appropriate medical treatment without causing undue financial hardship to yourself or your family.
Lastly, restraining orders can be put in place, though from what I hear these are difficult to get issued/served.  It really sounds like the neighbors are really a bunch of jerks and I feel for you...jerks are everywhere these days and (I'm sad to say) I feel as time goes by it will only get worse.
In the mean time, feral cats are NASTY, VERY NASTY and very devastating to small wildlife....wash thoses scratches regularly, put some antibotic cream on them, and take plenty of vitamin C .
Best wishes,
Ed