What happens to the devoted wife if her husband gets enlightenment?

Question

According to Shāstras, if parents give their daughters to the guy whose ultimate aim is to attain Brahman, they attain Brahmāloka which is the second most difficult attainment after Moksha because it is easy to get Moksha in Brahmalok due to its environment.

Also, husband & wife if devoted to each other are destined to marry in every birth due to concept of Runanbandha until they are devoted to each other.

Now, suppose husband attains Brahman or gets enlightenment, does enlightenment will automatically (if not suddenly, from Brahmāloka) follow to the wife because of inference from the concept of Runanbandha? It seems reasonable because a devoted wife or husband are destined to mingle again & again until devotion last. Wife being devoted to husband won't get any attainment other than Brahman if his husband attains Brahman only as she is supposed to mingle with him only.

So are there any scriptures which says so directly or indirectly?

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This question has been dealt in AnugitA (2nd discourse to Arjun by Lord Krishna) like this.

On this, too, O chief of the descendants of Bharata! they relate this ancient story, (in the form of) a dialogue, which occurred, O son of Prithâ! between a husband and wife. A Brâhmana's wife, seeing the Brâhmana her husband, who had gone through all knowledge and experience, seated in seclusion, spoke to him (thus): 'What world, indeed, shall I go to, depending on you as (my) husband, you who live renouncing (all) action, and who are harsh and undiscerning. We have heard that wives attain to the worlds acquired by (their) husbands. What goal, verily, shall I reach, having got you for my husband?' UpagitA - Chapter 5.

Answer 1

A wife devoted to husband, depending on her tapasyA and karma, would follow her husband in form of consciousness or subtle body. There is an example in AnushAsanika Parva, where a half part of a devoted wife follows her husband to higher regions and remaining half also flows as a river (deity):

the guest appeared in his splendid and glorious form. “O Sudarsana! I am Dharma Devata. (Deity of Dharma). I have come to test your mind and your devotion towards guests. Mruthyu is waiting to kill you whenever you transgress dharma. But you conquered Mruthyu. You have already conquered the six rivals viz., Kama, krodha, lobha, moha, mada and matsarya. Your wife is your virtuous follower. You both are eligible to go to higher regions with this physical body whenever you wish. With half of the power of your Tapas, your wife Oghavati transforms into a holy river and flows on this holy land. With the rest of the power of your Tapas, she remains with you in human form and serves you.

This same story is described with different words in sacred-texts:

... And thou shalt attain to all the worlds in this thy body, and as truly as the science of Yoga is within her control, this highly blessed lady will follow thee with only half of her corporeal self, and with the other half will she be celebrated as the river Oghavati!

_{Trivia: The river OghAvati is known as Saraswati today, which is very much near to Kurukshetra, where the MahAbhArata battle happened. The river was/is considered sacred since a long time.}

Besides this, the famous examples are there of MAdari following PAndu to Pitru regions and GAndhAri following DhritarAshtra to higher regions after their deaths.

From these examples, we can assume that a wife is highly likely attain the "enlightenment" or the similar "loka" as her husband. Moreover, a form of Bhakti is also -- being in company of enlightened person. A devoted wife fulfils this criteria with flying colours!

BG 13.26 - But others who are without [transcendental] knowledge, perform worship by hearing from others [who know], they also surely transcendent the death, being devoted to listening

_{Also refer this answer for non-devoted wives.}