So the trader made her a new account in blockchain. The trader sent both the password and walletId to my friend for logging in but then she is unable to log in saying there was an error.
There is never any legitimate reason for someone else to create a web wallet account for you. So many different types of scam begin this way.
After contacting the trader he said that there is a bitcoin synchronization error and that payment is needed to complete the process. But then I was just wondering, does it really cost some money to sync a bitcoin wallet?
It doesn't. This is an
advance fee scam. You do
not need to pay money to receive bitcoin.
Also the trader says that another deposit of money should be made because after the said synchronization because it needs the deposit to fully sync the bitcoin wallet because it will only lead to a non spendable funds to the bitcoin wallet. My friend tried to ask the reason for the 2nd deposit and the trader just replied that deposit is needed because the synchronization was done on a different country and location. Up till now I am telling my friend not to make the deposit.
If your friend has already paid the first "deposit", I'm sorry to say that the money is gone. She's not getting it back. All she can do now is
not send any more money to the scammer. The scammer will just keep making up reasons for her to send more and more money until she either wises up to the scam or goes broke. At no point will she ever see her supposed "profits". There aren't any.
I am having a hunch telling me that my friend is being scammed.
Your hunch is correct.