A pronoun is something that replaces a noun like for instance take a table. If you have mentioned a table many times and it is getting a bit repetitive, use the word it instead of table. The same here happens for the word she. Let’s say her name was Linda. Linda went to the shop. Linda watched TV. Linda fell asleep. It’s a bit repetitive. So you would say Linda went to the shop. She watched TV. She sell asleep.
