In As You Like It, what is Rosalind's attitude before going to the forest?

Are you talking about when we first meet her in the play,
or when she has just been banished by her uncle? If it is the latter you are refering
to, you can find the answer by reviewing Act I scene 3. Examining Rosalind at the
beginning of this scene reveals that she is very depressed, in spite of her cousin's
attempts to cheer her up and make her smile. Note how she bemoans the struggles and toil
of the world when she says: "O, how full of briers is this working-day world!" The
entrance of her uncle with the news of her banishment of course does not help matters
much. However, as the scene progresses, and Celia manages to talk to Rosalind and bring
her around, Rosalind's attitude seems to change dramatically, as she and Celia begin to
look forward to their exile and journey into the forest, once they have considered the
various precautions they need to take as young single women. Note Celia's last speech,
for example:

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Now go we in
content

To liberty and not to
banishment.

There is a sense
in which this "exile" actually liberates Rosalind and Celia, and we can imagine that
Rosalind is now much happier about leaving court as she can do it with her beloved
cousin and also look for her father.