More suitable word than "coo"?

Question

“Good afternoon, class. I hope you have a safe and lovely weekend,” she cooed.

This is a teacher talking to her class

Answer 1

Try -

murmured

mumbled

muttered

Hope this is what you are looking for.

;p

Answer 2

She said with enthusiasm

She said lethargically

she said concerned

Answer 3

She said softly.

She said pleasantly.

She said in a quiet voice.

*

Answer 4

she said !

unless she is a pigeon as they coo

Answer 5

You could try "smiled" or "simpered".

Answer 6

You coul try:

susurrated - issue soft noises

whispered

murmured

sighed

soughed - make a moaning or murmuring sound

purled - make a murmuring sound

Answer 7

It is usually the sound made by a pigeon.

However, it is often used to refer to someone speaking softly or lovingly; "The mother who held her baby was cooing softly"

Answer 8

It is quite a suitable word, in a figurative way, meaning she spoke to them in a very pleasant and soothing manner (like a bird song).

Alternatives could be chirped, twittered. Without using a figurative word you would have to say something like, murmered sweetly.