I tried giving ginataang mashed kalabasa with malunggay to my toddler and I was scared when I witnessed she almost got choked. Maybe because of the malunggay? Should I just powderized the malunggay or tear it in small pieces before cooking? Better ideas?

Sometimes they choke and are easily often to recover -- I suppose this is part of the learning process to handle solid food? As long as it's in a safe size (yes, chop it up into small pieces), I think it's okay to keep letting your child "practice" eating and swallowing. You might be doing her a disservice by serving it powderized.