haha ha wazawaza omoi nimotu wo motte kite kurenakute mo yokatta noni, egao de tetudatte kureta.

わざわざ means going out of one’s way or making a special effort.

In this sentence, it suggests that the mother did not just help casually; she made an extra effort, possibly despite inconvenience. It often carries a nuance like:

• You didn’t need to do all that
• You made a special trip / special effort

So it adds a feeling of appreciation, and sometimes also a sense that the speaker feels slightly sorry the other person had to bother.

は marks 母 as the topic: as for my mother...

Using は gives the sentence a more natural, narrative feel, especially when the speaker is commenting on what the mother did.

If you used 母が, it would sound more like you were specifically identifying mother as the person who did it, as opposed to someone else.

So here:

• 母は = speaking about mother as the topic
• 母が = emphasizing that mother is the one who did it

The difference is based on the speaker’s point of view.

• 来る = come, toward the speaker or the speaker’s location
• 行く = go, away from the speaker or current reference point

So 持って来て means bring (it) here / to where I am and 持って行って would mean take (it) there / away

Because the mother brought the heavy luggage to the speaker’s side or location, 来て is the natural choice.

くれる after a verb shows that someone does something for me or for someone in my in-group, and that the speaker sees it as a favor or benefit.

So:

• 持って来てくれる = bring it for me
• 手伝ってくれた = helped me / helped us

This is not just a plain description of the action. It includes the speaker’s perspective that the action was helpful or kind.

That is why this sentence feels warm and appreciative.

It means didn’t have to do it for me or more literally:

• くれなくて = not do it for me
• も = even if
• よかった = it would have been fine

So 来てくれなくてもよかった means:

It would have been fine even if she had not come and done that for me.

In smoother English:

• She didn’t have to do that for me
• There was no need for her to go that far

A key point: this does not mean she didn’t do it.
It means the speaker feels that doing it was unnecessary from the speaker’s point of view, even though she actually did it.

This is a very common question.

• 〜なくてもよかった = didn’t have to do
• 〜なくてよかった = I’m glad I didn’t do

Examples:

• 行かなくてもよかった
  = I didn’t have to go.

• 行かなくてよかった
  = I’m glad I didn’t go.

In your sentence, くれなくてもよかった means she didn’t need to do that for me, not I’m glad she didn’t.

Here のに adds a feeling of although / even though / when there was no need to.

In this sentence, it connects the speaker’s feeling:

• She didn’t have to go out of her way like that, and yet...

Then the sentence continues with:

• 笑顔で手伝ってくれた = she helped with a smile

So のに makes the sentence emotionally richer. It can suggest:

• appreciation
• mild surprise
• a feeling that the mother was especially kind

It is not just plain contrast. It often carries the speaker’s emotion.

Because two different actions are being presented as favors to the speaker.

1. 持って来てくれなくてもよかった

   • bringing the heavy luggage for the speaker

2. 手伝ってくれた

   • helping the speaker

Each くれる marks that action as something kind or beneficial from the speaker’s point of view.

So the sentence is not only describing what the mother did. It is describing those actions as considerate things she did for the speaker.

笑顔で means with a smile or smiling.

The particle で marks the manner or state in which the action is done.

So:

• 笑顔で手伝ってくれた
  = she helped me with a smile
  = she helped me smilingly

Here で is not marking a place. It is showing how she helped.

荷物 means luggage, baggage, or load. Japanese nouns usually do not have a built-in singular/plural distinction.

So 重い荷物 can mean:

• a heavy bag
• heavy luggage
• heavy baggage
• a heavy load

The exact English wording depends on context.

Usually yes, it means she helped the speaker or the speaker’s side.

Because of くれた, the action is understood as benefiting:

• me
• my family
• my group
• someone closely connected to me

So in most contexts, 手伝ってくれた would naturally be understood as she helped me or she helped us.

It implies that she did do it, or at least that the speaker is talking as if she did.

That is because 〜なくてもよかったのに means:

• she didn’t have to do that
• there was no need for her to do that

It does not mean she didn’t do it.

So the emotional meaning is something like:

She really didn’t need to go out of her way to bring the heavy luggage, but she even helped with a smile.

That is why the sentence sounds appreciative and touched.