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6:23 AM PT -- We just spoke with Valentina Shevchenko who says she will NOT back out of UFC on FOX 20 ... telling us straight up, "I will fight Holly."

When asked about her health, she told us, "I am feeling good. No injuries. Just a few days was a very big stress to me. I’m just starting to feel better now.”

UFC honcho Dana White says he's not sure if Valentina Shevchenko will still fight Holly Holm in July -- after V.S. dodged bullets in a bloody shootout in Peru ... calling the incident "madness."

As we previously reported ... Shevchenko and her trainer were eating at a chicken restaurant when 3 masked gunmen barged in and began robbing the place.

Shevchenko's trainer pulled out a gun and began firing -- killing one of the robbers ... but he suffered a gunshot to the stomach in the process. Shevchenko escaped unharmed. Her trainer is being hospitalized and is expected to survive.

Wednesday night, White told us he's unsure if Shevchenko will fight Holm at UFC on Fox 20 in July -- but seemed to understand if she decides to pull out.

"When things like that happen, it puts you in touch with your mortality," White said.

Meantime, Shevchenko has issued a statement of her own -- calling her trainer a hero ... whose quick actions saved her life and the lives of the other patrons.