I'm going to ignore my best friend after she made me upset on my birthday
How did she make you upset?
She had a party without inviting me and my friends and she did not gave me my gifts on time
I understand that it can be upsetting for a friend to have a party on the same day as your birthday. You shouldn't ignore her and instead confront her about why she has the party.
I don't want to talk to her. I feel better having decided not to talk to her anymore.
I am sorry that she hurt you on your birthday but holding onto anger is bad. You will feel better to forgive her. You don't have keep being friends but at least you won't be angry when you think about it in the future.