Short answer. Your recovery is limited. Article 1971 of the Civil Code restricts you to claiming only the amount by which the minor was enriched or benefited from the sale. If she spent the proceeds and gained nothing net, recovery becomes very difficult. The law protects minors even when they have acted wrongfully.
What the law says
the depositor shall only have an action to recover the thing deposited while it is still in the possession of the depositary, or to compel the latter to pay him the amount by which he may have enriched or benefited himself with the thing or its price.
Civil Code, Article 1971 — Deposit With an Incapacitated Depositary. Read the full provision →
Why the law limits your recovery
The Civil Code protects persons who lack full legal capacity — including minors — from the full consequences of contracts they entered into. When you chose to deposit property with a minor, the law considered that choice as one you made at your own risk. Article 1971 reflects this: because the depositary lacked capacity, the ordinary rules that would hold a depositary fully liable for breach do not apply in the same way. Your remedies are deliberately narrowed, not as a punishment to you, but as a protection the law extends to those not yet legally capable of fully understanding their obligations.
The two remedies the law gives you
Article 1971 allows two actions. First, you may recover the thing itself — but only while it is still in the minor's possession. Once she sold it, that avenue closed. Second, you may compel her to pay the amount by which she may have enriched or benefited herself with the thing or its price. This is the enrichment measure, not the full value of your property. If the property was sold for ₱50,000 and she spent every peso with nothing to show for it, the enrichment at the time of the claim may be nothing. If she still has proceeds, goods purchased with the proceeds, or any traceable benefit, that is what you can pursue.
What about the buyer?
The article gives you a separate option against the third party who bought the item — but only under one condition: if a third person who acquired the thing acted in bad faith, the depositor may bring an action against him for its recovery. A buyer in bad faith is one who knew, or should have known, that the minor did not have the right to sell the property. A buyer who had no knowledge of the deposit, paid a fair price, and had no red flags about the transaction is likely a good-faith purchaser and is protected. Whether the buyer in your situation acted in bad faith is a fact question that depends on what the buyer knew.
Practical outlook
This is a genuinely difficult situation, and the law does not offer a full remedy. If the minor has no remaining benefit from the transaction, your practical recovery may be very limited or even nothing from her. Your better prospect may be against the buyer, if you can show bad faith. Gather every piece of evidence now: documents proving the deposit, evidence the item was yours, any communications with the minor or her family, and whatever you know about the buyer and the circumstances of the sale. These facts will determine whether a claim against the buyer is viable, and that is the question worth pursuing with legal assistance.