Ex Wife Wants To Change Parenting Plan Without Taking Me To Court

Okay internet lawyers ;) I have a good one here.
My ex and I were married and divorced in Arizona. After our divorce I moved to another state for work but still came and saw my children every other weekend. This has continued over the past 8 years. I also get the children for 1 month in the summer and we also split Christmas break. I have done all the traveling and it hasn't been an issue. In January, my ex remarried and moved to Texas. I still go and see my children even though it costs more than twice the cost, ~$700 vs ~$300 for a round trip. Our parenting plan states that "all exchanges will occur at Sky Harbor, for both pickup and drop-off" for summer and Christmas exchanges.
I woke up to a text from her this morning stating the following: I'm going to copy and paste the texts since I cannot attach screen shots.
"Her: I wanted to coordinate when and where you fly in to pick up kids for your summer parenting time. June 15th you can pick up the kids from Sky Harbor. I need to know your flight details so I can have kids there at the right time. July 13th is the day you bring kids back and we will be back in Texas by then. So let me know what time you land in either DFW or Love Field airport so I can arrange my schedule to meet you there and get the kids.
Me: Until our parenting plan changes then we will follow how it states.
Her: That's not how it works. And it won't go the way you think if you try this charade. I've talked to my attorney and you have no legal weight here.
Me: So we don't have to follow the parenting plan?
Her: Please have all tickets purchased before I send kids with you on June 15th. I need to see return tickets as well so I know you will return to mothers home as it states in our parenting plan."
My big question is, can she change it without taking me to court first?
What would happen if I don't purchase return flights to Texas before picking them up and she refuses to send the kids?
I'm living paycheck to paycheck and I can't really afford to pay $1,500 for a retainer for a lawyer right now.
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