Why won't one person get my text messages

So I can text everyone except one user I have an iPhone with verizon and she has a iPhone with Verizon and she tells me she texts me but I don't get them and she doesn't receive mines either we get them sometimes not all the times it's bothering me not talking to her i don't know if its my phone or her phone or it's Verizon's network is anyone have problems with this?

Your text messages travel over the voice part of the network. It sounds to me like a routing issue with one of your numbers. If one or the other has brought the number over from another carrier, it may cause this issue. That person should contact Verizon.

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