Mi abuela trae la cuchara a mí.
1) mi abuela me lo trae.
2) mi abuela me la trae.
3) mi abuela se los trae.
4) mi abuela te la trae.

2) Mi abuela me la trae.

Explanation:

Let's first explain the indirect object in this sentences.

Mi abuela trae la cuchara a mí.

A mí (= to me) is the indirect object of this sentence and it indicates the recipient. The short form for this would be me.

Mi abuela ME trae la cuchara.

The direct object of this sentence is la chucara (the spoon). We determine the direct object by making a question: WHAT does the grandma bring? As LA cuchara is femenine, the short form would be just LA.

Mi abuela me LA trae.

We should just be careful with the word order: the short forms come before the verb.