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This question already has an answer here:

Did you know that Julia is having a baby? She ... (make) a great mother, I’ve no doubts.

Should it be will or is going to? And why exactly?

marked as duplicate by FumbleFingers, Peter, shin, ColleenV Jul 4 '18 at 13:06

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    (In your exact case, few if any native speakers would see any difference in meaning between the two future tense forms.) – FumbleFingers Jun 11 '18 at 12:22
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Let me improve the already stated answer by @Astralbee

According to Cambridge Dictionary

Be going to or will?

Will is often used in a similar way to be going to. Will is used when we are talking about something with absolute certainty. Be going to is used when we want to emphasise our decision or the evidence in the present

More info: (1) be going to - (2) will

Both can be used in predictions. In your context, use will if you want to express it with absolute certainty, if you want to exhibit complete confidence; otherwise use be going to.

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They both convey pretty much the same meaning. I would happily use either. If I were to examine them in minute detail I would say:

She will make a great mother

I think this is sounds the most certain - that you believe she already possess the qualities of a great mother.

She is going to be a great mother

This could be interpreted to mean that she will become a great mother, therefore she may not yet possess all the qualities needed. But really, you'd have to be extremely paranoid to extract that meaning from it.

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