get her clothing accessories like a scarf or maybe a necklace. something she can wear but is subtle, if she wears it you will know she like it. She will get the hint
Depends where it is in the sentence. "The birthday girl and I are going to eat cake." "Give the cake to the birthday girl and me." If it helps with compound subjects or nouns like this, imagine taking out the noun that isn't "I" or "me."
find out what drives her crazy, girls like jewellry or simply take her out.
A pony
gift
you should give them like barbie if it is a boy and a hot wheels car if it is a girl
an girl like a birthday present like chocolates, brasslet, books, are anything that makes her happy.
you can give her/he a card or if it is a girl you could give her some flowers.
The single act of remembering a girl's birthday won't make her like you. However girls do like it when guys remember their birthday's, especially if they like the guy a little already or if they're friends.
you give her 20 dollars
birthday present. necklace or fancy candy or something.
Probably a spa party, if you'd like to do one tell me and I'll give you my party plans.
Give her a vase with flowers.