I am in a long distance relationship with my girlf

I am in a long distance relationship with my girlfriend. I am 26 while she’s 20. She’s not really from financially upright home, so I am always available to help her out financially from the little I have.
But I noticed that she tells lies, especially when trying to tell me reasons why she couldn’t pick my call at night or respond to my message fast. It sometimes annoys me when she replies by messages 3 minutes after but I reply hers immediately.
Recently, I sent her money to get a new phone because her phone was faulty. Upon receipt of the money, my girlfriend didn’t buy the phone. Instead, she said she lent her mum. I didn’t get mad over it. I let it slide.
Few days ago, she was returning to school and I sent her some money also so she could get some things. She told me that she wanted to buy a pair of shoes from the money. I was happy for her and asked her to send me a picture of the shoe once she gets it.
After a few days, i remembered the shoe discussion, so I asked if she had gotten it. My girlfriend said “yes” and she sent me a picture of the shoe. Unbelievably, she had sent me an old picture of herself, wearing that same shoe. I didn’t say anything Cos I knew I had caught her lying this time. I called the following day to express my disappointment and she said truly, the picture was that if2 an old shoe. Why then did she lie to me. I just thinking it’s clear now that she had been lying to me in the past. I feel hurt right now and don’t want to talk to her. Is this reason genuine enough to end my relationship with her and look for someone closer and more truthful to me.