What do advice means in the dictionary?

1. Guidance or recommendations offered with regard to prudent future action.

2. formal notice of a financial transaction.

3. information; news.

4. Take advice — obtain information and guidance, typically from an expert.

5. Reccomendation regarding a decision or course of conduct

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."