A purse stands for what you carry of yourself: resources, identity, private things. Losing it in a dream is read as feeling exposed or scattered; a full one as feeling secure. Searching through a purse and not finding something is usually read as missing a piece of yourself or a skill you need. Someone else opening your purse is linked to invaded privacy, while a heavy, overfilled purse points to worries carried around all day. An empty purse is often tied to tiredness rather than literal money. It can help to notice what you most want to keep close.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.