Azriel Clary — one of R. Kelly’s former girlfriends — remains steadfast in testifying against him in his federal sex crimes case … despite what her family describes as attempts to scare her away from going through with it.

Azriel’s father, Angelo, tells TMZ … nobody’s forcing his daughter to testify — it’s her decision based on her belief that what Kelly did to her and others is wrong, and she wants to do it for the sake of justice and to show what a monster he truly is.

Problem is, this apparently doesn’t sit well with many of the singer’s fans. We’re told Azriel and her family are the frequent targets of online threats and attacks … including people posting their contact info and even harassing them at work.

Even scarier … Azriel’s car was set on fire last year, and just months ago a man pled guilty in the case.

For all these reasons and more … Angelo says his daughter’s stress level is high as she prepares for her testimony, but he’s adamant Azriel will not back down.

In early 2020 — after a falling out with Kelly’s other girlfriend at the time, Joycelyn Savage — Azriel fully removed herself from Kelly’s corner and began working with the feds against him.

Now, the time is almost here for her to take the stand, and we’re told Azriel’s looking forward to showing her strength and telling her truth … with Kelly watching.

As of now, we’re told it looks like Azriel will testify in court sometime next week, and when she does … Angelo says he’ll be in the courtroom to support her.