Is Krillin daughter strong?
No. So far, there hasn’t been any hints that suggest that Krillin and 18′s daughter is as strong as her parents. She should also be biologically human in every way. So without her father’s training and her mother’s cybernetics, she’s really just an average human child.
Can Krillin beat Goku?
As for WHY Krillin didn’t get utterly demolished by SSB Goku, the answer in this case lies in past plot points of the show. Back when Goku used Kaio-ken vs Hit, he stated that he could pull it off with SSB because of a combination of strength, calm mind and complete ki control.
Why did the androids turn good?
When Goku wishes back Earths population he made the stipulation that everyone had to come back with a good heart. And because the Androids are originally humans 17’s heart was affected by the wish. 18 became good when Krillin tries to wish her into a human but Shenron explained that it’s pointless.