The sad issue here, from what i can make out, is that the crew member had a nut allergy, she was working in Europe (away from base) and so will have had difficulty in sourcing her own food with her being in a hotel. Under those circumstances, there is no way that she should have been fired or even disciplined. If that was the scenario anyway. It should have been noted on the flight report though.
Stealing stock, regardless of cost, is stealing though and you cannot differentiate between the low value and high value..... regardless of how tempting it is to do so. How many of us would be incensed if the theft of our clapped out M-Reg fiesta was disregarded by the police in stark contrast to your neighbours BMW 5 series being nicked?
As for easyJet crew pay. After your first year, your actual take home pay is particularly good. Depending where in the UK you are based, a junior crew member earns 24-26K before tax whilst a cabin manager is on circa 29-32K per annum. (Average UK salary is 28K) Those rates are made up of...
Basic Salary
Sector Pay (Pay for actually operating flights)
Commission (this is what can make differences depending on base-certain bases, generally Northern ones, offer greater commission)
With that in mind, there is no reason to believe that crew are so poorly paid they have to steal. JosuaNkomo is indeed correct when I says that in the early days of 'mixed fleet' easyJet lost crew to BA and they saw a substantial difference to their pay.