Bitcoin rise is LTC's gain. That's been the case this past months while monitoring LTC and BTC price on coinmarketcap.
The dollar price of litecoin has not risen. It is quite stable. Its price relative to bitcoin has dropped, similar to other coins.
It has risen... actually depends of the time period that you are looking at. And if you compare the graphs of BTC/CNY BTC/USD and LTC/USD you will see that they rise and fall exactly at the same time and intensity. And if you look the last 30 days, BTC and LTC had a 10% increase. But if you look the last 7 days, BTC had a 20% increase while LTC only had 10%, so, this is where your drop in relative price comes from