Speaker and Mother's Relationship
Based on the given conversation, it can be inferred that the speaker and the 'mother' are related. However, the exact relationship is not explicitly mentioned in the provided information. The speaker could be a sibling, a close family member, or even a concerned friend addressing the child's mother.

Child's Feelings
Upon hearing these words, the child must have felt a range of negative emotions, potentially including confusion, hurt, shame, and embarrassment. Let's explore these emotions in detail:

1. Confusion: The child may have been confused about why the speaker is making such a statement, especially if they were not experiencing any suicidal thoughts or actions. They may not understand why the speaker is assuming such a drastic situation.

2. Hurt: The child could feel hurt by the speaker's harsh and judgmental words. Being accused of appearing on the "brink of suicide" without any apparent reason might deeply affect the child's emotional well-being.

3. Shame: The child might feel ashamed and humiliated by the public comment made about her emotional state. It can be distressing for a young child to have her private emotions exposed and talked about in such a negative manner.

4. Embarrassment: The child may also feel embarrassed because the speaker's words draw attention to her emotional state, potentially making her feel different or abnormal compared to others. This can lead to a sense of isolation and discomfort in social situations.

5. Emotional Impact: The child may experience a heightened sense of anxiety or sadness due to the weight of the words used by the speaker. Such a comment can leave a lasting impact on a young child's emotional well-being and could affect her self-esteem and overall mental health.

It is important to note that the child's reaction may vary based on her individual personality, previous experiences, and support systems. However, the given words are likely to have a negative impact on her emotional state and perception of herself.