The chakra is Hamura chakra, which she in fact receives from Hamura and the rest of his clan from a zombie (this is actually the weird truth) Naruto attempts to destroy the tenseigan, but Hinata tells him that only Hamura chakra can affect it, and she charges the received purple chakra and does the twin lion strike. Because Hinata lacks a forceful enough attack, it is useless, and that is where Naruto suggests that the two of them attack together; Hinata to provide the chakra, and Naruto to provide the strength. They make a purple lion (that looks like a dragon) with a glowing ball inside of it. This attack works.
In conclusion, while Hinata does in fact receive more potent chakra, because she is Hinata (and lacks attack strength as per her character) it doesn't seem to be much of a factor.