You don't "need" an attorney. But, based on the limited information you have provided, it sounds like it would be highly advantageous if one was retained. (The other side has an attorney, your daughter's damages could likely exceed the small claims court limit, etc.)
This attorney is licensed to practice law in the State of California. The laws of your jurisdiction may differ and thus this answer is for informational and educational purposes only and is not to be considered as legal advice. Since all facts are not addressed in the question, this answer could change depending on other significant and important facts. This answer in no way constitutes an attorney-client relationship.
It all depends on the amount of your damages. If your damages are $10,000 or less, you really should go to Small Claims Court. If your daughter was hospitalized and had serious medical bills exceeding $10,000, and you can prove (and a doctor will testify) that the mold was the causation, then you could seek out legal counsel.
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