Need phone geek help

Kidsandliz went on a bit of a rant said
2

My kid just got a cheap android phone (Galaxy J 7 sky). She called me on it. I made a contact from that call. I then texted her and someone else got the text. It never showed up on her phone. That someone else texted back and kept saying “stranger danger” over and over and “report”; they asked me who I was, just weird stuff. It wasn’t my kid being a jerk.

My kid can text me and when I reply she never sees it. When I text she never sees it. Whomever my texts are going to isn’t answering anymore. I am presuming that person blocked me somehow. My kid says on her phone I am not listed as blocked. What the heck is going on? And more importantly, how do we fix this?

She seldom answers her phone so I have to mostly text her and now I can’t. I am using someone’s old iphone 5 which is locked to AT&T and I buy straight talk cards, it works how it should except for this.

If anyone has any clue what the heck is going on and how to fix it I’d sure appreciate it. Googling didn’t really help as the answers were for when both people had iphones. Oh I texted her from someone else’s phone and it went through just fine.