Se você chamar a técnica hoje, ela pode consertar o carregador também.

Because in Brazilian Portuguese, after se when you’re talking about a condition that refers to the future, you typically use the future subjunctive: Se você chamar... (= if you call...).

• Se você chamar a técnica hoje, ... → future condition
• Se você chama a técnica todo dia, ... → present indicative for habitual/repeated actions
  Using chamará after se is generally not how Portuguese forms this kind of “if” clause.

It can work as any of those depending on context, but most commonly it’s a neutral conditional with a suggestion-like feel:

• If you call the technician today, she can/might also fix the charger.
  It often implies: “That would be a good time to handle both issues.”

Either is possible. pode can express:

• Ability/possibility: she can fix it (it’s within her ability / it’s feasible)
• Uncertainty/possibility: she might be able to fix it (not guaranteed)
  In everyday speech, pode often sits between can and might, and context clarifies how certain it is.

It separates the conditional clause from the main clause:

• Se você chamar a técnica hoje, ela pode...
  This comma is very common and helps readability. In informal writing, people sometimes omit it, but keeping it is standard and clear.

It uses ela because técnica is grammatically feminine and (here) refers to a female technician. If the technician were male, you’d typically say:

• Se você chamar o técnico hoje, ele pode consertar o carregador também.

Chamar is broader: it can mean to call/summon/contact someone. If you specifically mean calling by phone, Brazilian Portuguese often uses ligar:

• Se você ligar para a técnica hoje, ... = If you call (by phone) the technician today...
  But chamar is still natural if the idea is “get her to come / request her.”

Chamar takes a direct object for the person you’re calling/summoning: chamar alguém.
Chamar para is used when you’re calling someone to a place or activity:

• chamar a técnica = call the technician
• chamar a técnica para vir aqui / para a empresa = call the technician to come here / to the company

Consertar means to fix/repair (especially something broken). Common alternatives in Brazil:

• arrumar = fix/straighten out (very common, slightly broader)
• reparar = repair (more formal/technical)

Yes, também is flexible. End position is very common and natural:

• ... ela pode consertar o carregador também.
  Other natural placements:
• ... ela também pode consertar o carregador. (emphasis on “she also can”)
• ... ela pode também consertar o carregador. (less common, but possible)

Yes. hoje is flexible, and placement changes emphasis slightly:

• Se você chamar a técnica hoje, ... (emphasizes “today” in the condition)
• Se você chamar a técnica, ela pode consertar o carregador hoje também. (emphasizes when the fixing could happen)