Will you crack the nuts Mom's brought, or maybe shall I/I shall do that?

Which word order is correct in the following case?
a. Will you crack the nuts Mom's brought, or maybe shall I do that?;
b. Will you crack the nuts Mom's brought, or maybe I shall do that?

a.2. Probably she won't come?..;
b.2. Probably won't she come?..

Sped Tiger said:

a. Will you crack the nuts Mom's brought, or maybe shall I do that?;

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That's not natural with 'maybe'
.
a. Will you crack the nuts Mom's brought, or shall I?

Sped Tiger said:

a.2. Probably she won't come?..;

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She probably won't come.

'Probably' is not natural in a question.

Sped Tiger said:

Will you crack the nuts Mom's brought, or should I do that?

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Is "Mom's" the person's name?

'Mom' (AmE) and 'Mum' (BrE) are two very common ways for young people to address their mothers. Like all names, they have an initial capital.

'Shall I' is natural in BrE.