I tried to replicate this and couldn't do it. What device are you playing on? I keep clicking on the snails and can't really find an explanation. But I could try to install a block mechanism.
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Sorry I didn't get back to you. I posted this morning before work, and just got back home.
I have ADHD and I just happed to be mad clicking on everything. But she only moved after I clicked on the snail. Sometimes she would move down after she had jumped if I clicked towards the bottom of her. Sometimes she would turn around and walk the other direction for 1 or 2 steps, the screen would go with her.
But if you found a way to lock her in place I doesn't really matter anymore