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Would like to know more about NityA Devi Goddess.
Does this Goddess belongs to DasaMahavidyas? if not, any relation with Goddessess in SriVidya Krama.

Is the below , Her dhyana ?

ArdgendumaulimarunAmamarAbhivandyAmambhojapAsha srini purnakapAla hastAm ||

No, NityA Devi, whose half-dhyanam you have quoted, is not part of the Dasha Mahavidyas. She is worshipped independently. Outside of Sri Vidya or Maha Vidya worship.

Brihat Tantra SArah gives her puja prayog and mantra as follows:

Atha nityAmantrah:

vAgbhvam kAmabijancha nityAklinnemadau punah |

dravei vahni badhur mantro dvAdashArnoyamiritah ||

Decoded, the mantra is:

Aim klim nityAklinne mada drave swAhA

The Rishi-Chandah-DevatA are Sammohana Rishi-Nivrit-NityA.

is the below , HER dhyana ?

That is only part of the whole DhyAnam. I quoted only that much in the other answer because there I had only to prove that she holds a skull-cup.

Her full DhyAnam is as given below:

ArdhendumaulimarunAmamarAbhivandyAmbhoja pAsha shrini purna
kapAla-hastAm |
RaktAnga rAga vasanAbharanAm trinetrAm
dhyAyechivasya vanitAm mada vihvalAngim ||

The deity has crescent moon on her forehead, has three eyes, she is of reddish
complexion and is worshipped by the gods. She has four arms and in the
hands she holds - a lotus, pAsha (noose), Vajra and a human skull. She is
wearing red color clothes and is decked with ornaments ..

This form of the Goddess is not worshipped within Sri VidyA.

The following is a picture of her Yantra (a Yantra always helps identifying the deity better):

Nityaa is a feminine form of Nitya (Eternal).Devi Adya-Shakti is eternal.

The mantra 64 of Chapter 1 of Sri Sri Chandi reads

Nityaa eva saa jagan-murtis tayaa sarvam idam tatam, meaning Goddess is Nityaa, the entire world is Her body and She is All-pervading.

This is the most beautiful depiction of Nityaa.

So ALL the forms of Mother Goddess that we worship are Nitya.

Yes, Dasa-Mahavidyaas are also Nityaa-s.

In specific purana, some particular form of Devi has been also named as Nityaa along with Vajra-prastarini.I do not have the reference with me at this moment.Hope someone wil be providing the details of that form.

But I repeat, All forms are Nityaa and Sri Sri Chandi is the most respected scripture among all the scriptures depicting the Mother Goddess.

Update

Nityaa alongwith Lalita and Vajra-prastarini, Annapurna etc are the devies of the Purva-Aamnaaya, according to Devyaagama-vachana in Tantra-Rahasya. Lalita is one name of Srividya. So according to this scripture, these two are related. (Reference: Sastramulak Bharatiya Saktisadhana, Upendrakumar Das,RMIC, vol 2, page 1049).But Sri Vidya explicitly is treated in the Samayachaara-Tantra as belonging to Purva-Aamnaya, and there Nitya is not mentioned.