Is Lucy telling lies?

In chapters 5-7 Edmond finally discovered Narnia. But, he said that Lucy was lying. From that moment, Lucy was completly miserable. She cried very often as well. This behavior concerned Peter and Susan. So, Peter and Susan went to talk with the Proffesor. The Proffesor was actually on Lucy´s side, this shocked Peter and Susan because, they couldn´t believe that such old man thought Lucy was right. One day, some visitors came to the house to look around . Mrs. Macready, told the children not to bother her while she was showing the visitors the house. All of them were exploring the house again. But, while they were exploring they heard the visitors and they decided to hide inside the magic wardrobe until the visitors got away. Inside the wardrobe, they finally steped inside of Narnia. When they got inside Narnia, they all were shocked. Finally, Susan, Peter,and Edmond offered an apology to Lucy. They all decided to go to the Faun´s house to visit him. When they arrived to the Faun´s house, they saw it was ransacked. The white witch captured Mr. Tomnus for helping Lucy. When they all steped out a red chest Robin made them follow him. Then, they met a beaver and he invited everyone to his little house to eat dinner.
Quote analisys
"And now a very curious thing happened. None of the children knew who Aslan was any more than you do; but the moment the Beaver had spoken [his name] everyone felt quite different.... At the name of Aslan each one of the children felt something jump in its inside. Edmund felt a sensation of mysterious horror. Peter felt suddenly brave and adventurous. Susan felt as if some delicious smell or some delightful strain of music had just floated by her. And Lucy got the feeling you have when you wake up in the morning and realize that it is the beginning of the holidays or the beginning of summer." (C.S Lewis, 67-68)

This quote shows the mystical power of Aslan. This quote shows that Aslan is a kind of god. For Lucy, Susan and Peter the reaction at his name is quite good and pleasant whereas Edmond has a unpleasant reaction because he is more on the Witche´s side. 

"...´Its my handkerchief, the one i gave to poor Mr. Tumnus´´Thats right,´ said the Beaver. ´Poor fellow..." (C.S Lewis, 67)

I wonder what has the Witch done with Mr. Tumnus. I hope nothing bad has happended to him, and that he´s alright. 

Conclusion
In colcusion, Peter and Susan finally believed Lucy, because they actually got to visit Narnia. All of them met the beaver and heard for the very first time Aslan´s name. I wonder if Edmond is going to bring his brother and sisters to the witch.