what is wrong with my parakeet

my parakeet has had 3 eggs this month she had her very first egg 2 weeks ago and she had one this morning and she just had another one. I have had this bird for almost 8 years and she has never laid an egg before but she had a mate with her 4 years ago and she never laid an egg what should i do

You need to make sure she has calcium and vitamins in her diet, first of all. You can look up info on this on the Web.
   
Another good Web search would be "Egglaying in Cockatiels" as they are very prone to this. Suggestions include altering their light-exposure and re-arranging and relocating their cage to make them feel less "safe" about raising a clutch. This is a rather serious problem that can develop into a habit that is very hard to break.
   
Let me know how this goes for you.