is it so bad not to greet my friend on her birthday? i don't feel like doing it

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she is a friend way back in high school (that's 10 years ago) and for so many years already,she has been forgetting to greet me on my bday.i would usually call her after that day and say,"hey,it was my birthday" and she'd say "oh,i remembered before your birthday but i forgot on the day itself!"and i'd usually say"oh,it's ok".now,i got her as a godparent for my firstborn son (only child to this day) and she didnt go to the baptism and to the 1st birthday celeb because she has to travel 7 hours to get to our city.but now that we live in the same city(but travel is 1 hour),she still didnt attend the 2nd birthday celeb.at first,she asked if i invited her ex-boyfriend who was a classmate too,and i said no because we arent close.still she didnt attend.i tried to wait for her explanation or excuse.about 3 weeks later i told her how i feel-disappointed that she didnt text me,answered my calls,nor returned call/texted back.she said she texted back saying she cant make it because her boyfriend was not available that day(i didnt get her text though).i felt even more disappointed.I still believe,if there is a will, there is a way.she said "sorry if i am always not able to come".i didnt feel any regret or apology with her text.on a note,she is also a godparent to the daughter of one of our friends.she didnt go to the baptism nor to the 6 bday celebrations as well even though they have been living relatively close since then(about 2 hours travel).but we two are the closest among us 4.so i would understand what she does to the other 2.but now, the other 2 are even more present to me than her. she once/twice called me up and we talked long-but because she was having a problem with her boyfriend then.she doesnt call me when she is happy. tell me,am i wrong to feel this way towards her now?i feel distant and hurt.i dont feel like greeting her happy birthday tomorrow.I don't want to be plastic,pretentious that all is well.i dont want to pretend that everything is ok,or what she is doing is ok anymore.i feel i,or our friendship is of no value anymore. am i being too harsh? too demanding with her? are my expectations too high?