Learn Hardcore Hebrew: היא עומדת לצלם את הגשר החדש, אבל שכחה את המצלמה בבית. - She is about to photograph the new bridge, but she forgot the camera at home.

Yes, עומדת literally means is standing. But in Hebrew, עומד / עומדת + infinitive is also a very common structure meaning is about to ... or is just going to ....

So:

היא עומדת = she is standing
היא עומדת לצלם = she is about to photograph

This is an idiomatic grammatical pattern, not just a literal description of posture.

Why is it עומדת and not עומד?

Because the subject is היא = she, which is feminine singular.

In the present tense, Hebrew verbs often look like adjectives and must agree with the subject in gender and number:

הוא עומד = he is standing / he is about to
היא עומדת = she is standing / she is about to

So עומדת matches the feminine subject היא.

What exactly is לצלם?