hi, tongtong, she does not need to pay buyer comm. For HDB, it is very clean cut. Seller agent gets 2% comm from seller. Buyer agent gets 1% comm from buyer. The same agent cannot represent both seller and buyer. Therefore, if your friend wants to sell the house herself, she will have to do everything herself. Includes submission of valuation, advertising on online prop websites, newspapers etc, scheduling of appts, handle the otp and all the paperwork herself, online booking of first appt, second appt, submission of resale transaction etc.
She will also need to get a 3rd party (cannot be seller or occupant of the flat) to act as witness eg. signing of otp form because buyer agent cannot act nor sign as witness for her.
If your friend is selling the house herself, Agents have access to the latest resale prices (even before they are lodged and published at HDB or URA website) so we know how to price the flat better based on latest info. Sometimes both seller and buyer refuse to budge on the price, having a 3rd party is easier to negotiate.
If your friend is thinking of selling then buying another property, we can negotiate on the actual comm. Anyway, if she is keen, you can ask her to call me at 91230588. No obligations.