Hillary, you say your daughter went into Anaphylactic Shock - what symptoms did she have - true anaphylaxis is potentially life threatening, my daughter's had 2 of these from nut allergy. If you managed to bring her out of the reaction with only piriton, it doesn't sound like anaphylaxis more like a reaction. There are various grades of reaction and anaphylaxis is the most serious - usually requiring hospitalisation and administration of adrenaline.
I know, from experience, that it is possible to have a reaction from touching items that have been contaminated. My DH had a chicken korma some years ago which contained coconut. He'd been having these for ages but, he didn't was his hands afterwards, picked up a pencil to make a note and then daughter used pencil shortly afterwards - big coconut reaction!
My daughter's now a teenager but she's lived with severe nut allergy - allergic to all nuts, coconut, oak trees/acorns, horses, cats, dogs and more... for 12 years+. We've had to adjust to this as a family, I have 2 other kids who are not allergic - when eldest goes to stay with friends etc I give the others treats that they couldn't normally have ie. Bounty bar or some of our curry etc. It's accepted that they will get a "nutty treat" if she's away for weekend or something.
It does start to get easier as they get older, they have to learn to take responsibility - admitedly you say your child is only 2 so you'll have a while to wait but, my advice would be, from experience, don't wrap her up in cotton wool, let her get out there and experience the world. Home schooling is, in my opinion, not necessarily the best way to go it's prolonging the agony for when she is older and has to go to school and nursery. Educational establishments are more clued up these days on nut and other allergies and do all they can to help - restaurants are better in fact, it's a lot easier now than when I started with this whole thing 12 years ago.
Let your daughter live, get a Medic Alert bracelet or similar identity necklace etc. this will keep all the information you need immediately to hand in the case of an emergency and help paramedics etc., it's amazing what peace of mind that can give you, check your GP/consultant, can you have some epipens to keep with you for emergencies but check that you know the severity of the symptoms to use them for. Sometimes an antihistamine is all that is needed for an external reaction - internal reactions ie. throat swelling, breathing difficulties etc. will be more likely to need adrenaline.
Anything else you need to know, just ask.
Regards, Katherine