Oh my. What @DylansMom said X2. A couple of thoughts... starting with your friend is correct on the restraining order front, and you should not wait for further incidents. You cannot negotiate with someone who is most likely (assuming the description is accurate) suffering from a mental illness or personality disorder of this severity. Peafowl aside, your first concern must be for your personal safety and the safety of anyone who shares your home. You should get the restraining order immediately -- hopefully she can help you with the process.
If you do not already have security cameras (available at big box stores, Sams, Costco and in every imaginable variety on Amazon), you would be well advised to set up a home video camera system (such as wireless web cams) immediately. Make sure you can record and preserve the recordings. Figure out how to block access to your driveway (gates) and install physical barriers such as perimeter fencing. Do not set foot outside your house without carrying your cell phone and be prepared to record or call for help. I am completely serious when I suggest you may want to consider moving. This person could easily be dangerous -- attempting to resolve this peacefully may simply escalate matters and put you in the way of physical harm.
Keep talking to your friend and see what other steps she would suggest, and what her recommendation would be for the future. Your mention earlier that other neighbors were also out looking for the traps to try to rescue the birds, makes me think the situation is sufficiently polarized that there is not an easy solution -- and there is no middle ground, sadly. Either there are loose birds or there aren't, so it's hard to come up with a compromise with the neighbors who are still sane and reasonable if they have signed onto the other side of the fight. Sadly, the neighborhood could become extremely unpleasant -- how frustrating for you.
Yes, pea eggs are not the easiest to hatch, so perhaps he will be unsuccessful -- we can hope. However, he is likely to acquire more birds and continue his campaign, regardless. As for breeding back, I suspect the breeder won't particularly care about familial relationships between the breeding stock -- it's not uncommon. At this point, the peas may be the least of your problems, even though they were the basis for the dispute.
As for your chickens, padlocks on pens are great, but make sure that there are physical barriers sufficiently far away that no one can harm them with tainted feed. They should be out of sight and there should be no way to get near them without you being alerted. It goes without saying that you must keep your garage door closed, your doors locked and your windows secured.
I'm so sorry that you are going through this. It could be a long, rocky road. Keep us posted, and above all, be conscious of your safety. Good luck.