"Either the well was very deep, or she fell very slowly, for she had plenty of time, as she went down, to look about her."
"However, on the second time 'round, she came upon a low curtain she had not noticed before, and behind it was a little door about fifteen inches high."
"When she got to the door, she found she had forgotten the little golden key, and when she went back to the table for it, she found she could not possibly reach it."
"She looked up, but it was all dark overhead; before her was another long passage and the White Rabbit was still in sight, hurrying down it."
1 answer
The detail from Chapter I that supports the idea that Alice shrinks after she drinks from the bottle is:
"When she got to the door, she found she had forgotten the little golden key, and when she went back to the table for it, she found she could not possibly reach it."
This line indicates that Alice has become too small to reach the key on the table, suggesting that she has shrunk after drinking from the bottle.
