One lady is looking at a blue box while the shorter lady is looking at something on her phone at the grocery store.
one lady looks at a box while another looks at her phone
If one lady is looking at a blue box and the other lady is looking at something on her phone in a grocery store it implies they are in the produce department of a grocery store and the woman is looking up something about the product on her phone to help the other woman.
Shorter lady is another, and looking at something on her phone is a paraphrase of looks at her phone.
One lady looking at box and one lady looking at a phone are consistent in both.