Ok i hope this helps, ive just been speaking to my boss (a pharmacist) he said if you are going to treat her yourself and lance it here are some good pointers.
Place a warm face cloth over the eye for 20 mins, keep moving it round so no cold is on the eye. Sterilize the head of a pin or needle with alcohol or a flame. Poke a hole in the head of the abscess, and allow the pus to drain. You may need to apply pressure to get the pus to drain. Apply antibiotic ointment once the pus has drained, and bandage the abscess. Bacitracin ointment is commonly used as a home remedy. Continue using warm compresses a couple of times a day for at least 3 days to ensure all the pus drains from the abscess. Dont squeeze the abscess as this will spread the infection to somewhere else. Hope this helps hun.. I feel for you as ive been there many times before.. Im lucky ive got a good boss who loves animals lol..xxx