Having R-DCS set will block everything that isn’t transmitted with the same DCS code. Leaving R-DCS cleared out allows you to hear everything that is transmitted on that frequency.
If you set T-DCS nobody will hear you except those who have a matching R-DCS or those who have no R-DCS.
My recommendation for someone who isn’t hearing an expected response on a repeater is to leave the receive tone off but you must have the correct tone or code (remember there’s both CTCSS, which is a tone, and DTCSS, which is a digital code) when transmitting.
You might also try getting closer to the repeater.
Finally, not everyone using GMRS wants to respond to an unknown person on a repeater. Have your daughter take the other radio and walk a ways away and see if you can hear each other on the repeater.