questions on tense

Hello,

I have a question on the sentences below:

  1. She let me use her car when she doesn’t need it.
  2. She let me use her car when she didn’t need it.

I think 2) is technically correct, but 1) is also possible. What do you think? Do you use 1) in spoken English? In written English, should 1) be wrong? Please let me know.

Thank you in advance,
sweetpumpkin

(1) would be
She lets me use…

she lets = present / doesn’t = present
she let = past / didn’t = past