Hey mama,
Here are some recommendations that I found:
https://threebestrated.sg/preschools-in-hougang
https://skoolopedia.com/app/childcare/area/hougang
It would be good to give the ones your interested in a call, see if you like what their values and philosophies are and then visit the shortlisted ones. I also feel bringing your child there to experience the school and see how comfortable she is there helps.
All the best!