A result of 75 or 76 on the Wild Magic Surge table triggers this effect:

You glow with bright light in a 30-foot radius for the next minute. Any creature that ends its turn within 5 feet of you is blinded until the end of its next turn.

Does this blindness affect the sorcerer who triggered the surge (since she will always be within 5' of herself?

Or are only other creatures affected by it?

Most likely only other creatures

This is similar to Aura effects in that:

You glow with bright light in a 30-foot radius for the next minute

While this doesn't use the word 'aura', the mechanical effect is similar in that you are the effect emanates from you in a specific radius. If we utilize this mechanical similarity, we can look at other Aura effects or spell effects with similar mechanics.

These all have different language in how the aura works that state (pulling from Paladin's Aura of Protection):

whenever you or a friendly creature within 10 feet of you...

Aura of Life also has differing language that states:

Each nonhostile creature in the aura (including you)

Every mechanic that involves something emanating from yourself includes langauge like the above. I have yet to find any mechanic that shows otherwise.

But it's awful wording

Reading it as-is does seem like you count. The only reasoning I've got otherwise I have above, but in a vacuum the blindness would extend to you. However, the support I've given above does strongly suggest that you aren't included by the absence of language that includes yourself.

Strictly she is affected, but you may want to decide that she isn't affected.

75-76 You glow with bright light in a 30-foot radius for the next minute.
Any creature that ends its turn within 5 feet of you is blinded until
the end of its next turn.

She is a creature within 5 feet of herself (0 even, she is the point of origin) and she will be blinded. She isn't exempt from effects unless the description states otherwise. If someone casts fireball on themselves, they will be affected.

For all purposes it is phrased like a Sphere (PHB 204):

You select a sphere’s point of origin, and the sphere extends outward
from that point. The sphere’s size is expressed as a radius in feet
that extends from the point. A sphere’s point of origin is included in
the sphere’s area of effect.

A sphere’s point of origin is included in the sphere’s area of effect this is also true for aura type of effects which have the person as the point of origin, but if you compare it to other rolls on the Wild Magic Surge table (PHB 104):

95-96. You and all creatures within 30 feet of you gain vulnerability
to piercing damage for the next minute.

You will notice that the wording is messy. It makes this awfully explicit that this might not be how the wording is intended. So I would recommend you to rule it as if she is exempt, and also extend that rule so that she is exempt from the 69-70 invisibility effect. Alternatively and strictly RAW, follow what the effects say. For both rolls, the latter would mean that she would be affected - she becomes blind on a 75-76 and invisible on a 69-70.

Compare further how the invisibility effects are worded (and be dismayed at their wording):

69-70 Each creature within 30 feet of you becomes invisible for the
next minute. The invisibility ends on a creature when it attacks or
casts a spell.

89-90 You become invisible for the next minute. During that
time, other creatures can’t hear you. The invisibility ends if you
attack or cast a spell.