Hello, I found an apartment in a 3 unit building with my sister.

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Hello, I found an apartment in a 3 unit building with my sister. The owner lives in one of the units. We went over today to sign the lease. It's a 1 year lease. We signed all the paperwork and gave her a check for the first months rent and a move in fee (no deposit). The lease starts in a week. She said she would send us a copy of the lease on monday from her office. Later, she called us and said that she was really sorry but she has a family member who wants to live there and we needed to find another place. I said that we already signed a lease but she said that she didn't deposit the money yet and we don't have a copy so it doesn't mean anything. She seemed sincere and we are living with family right now so it's not a huge deal but can we pursue any legal action with this? Or is there anything we can say to her to still get us the apartment? I understand her situation but we did sign paperwork. I regret not getting a copy of it or taking a picture of the check or anything.