I bought my 5-m.o. baby a teether, but looks like she's not interested in it. Any way for her to like it?

It could be due to the type of teether. There are wooden, rubber, silicone, gel and plastic teethers to name a few. My baby likes chewing on a water filled teether from Pigeon which has been chilled in the fridge. It costs less than $5 and can be purchased from NTUC Fairprice. You can also get silicone teething necklaces from Mumspick.